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00:31:00

The Adventure of Cold Atoms. From Optical Pumping to Quantum Gases

by Claude Cohen-Tannoudji
The Adventure of Cold Atoms. From Optical Pumping to Quantum Gases
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 813 views
Rating:

Conservation laws are very important in quantum physics. Two examples of applications will be given. First, optical pumping which uses transfer of angular momentum from polarized photons to atoms to produce highly polarized atomic gases. Then, laser ....

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00:29:00

A New Kilogram in 2018: The Biggest Revolution in Metrology Since the French Revolution

by Klaus vonKlitzing
A New Kilogram in 2018: The Biggest Revolution in Metrology Since the French Revolution
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 1005 views
Rating:

Metrology - the science of measurements - is responsible for the international uniformity and precision in standards. Today, the seven units for meter, kilogram, second, ampere, kelvin, mole, and candela of our international system of units (SI units....

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00:33:00

What About Redefining Time Using a Stable Laser?

by John Hall
What About Redefining Time Using a Stable Laser?
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 837 views
Rating:

Several laser-based Atomic Clocks now have an accuracy potential of ~2 x10-18, a hundred-fold better than the best achieved after more than 60 years' experience with rf resonances in Cs atoms. Still, this long attention span documents that the Cs Fou....

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00:44:00

The Future of Particle Physics

by David Gross
The Future of Particle Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 1064 views
Rating:

Elementary Particle Physics seeks to discover the basic constituents of matter and understand the fundamental forces that act on them. In this lecture I shall review the current state of particle physics, the grand success of the ñstandard modelî, ....

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00:37:00

Discovery of the Higgs Particle

by Martinus Veltman
Discovery of the Higgs Particle
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 915 views
Rating:

Recently the Higgs particle has been discovered at CERN. This particle was theoretically predicted. The historical development of field theory, leading to this prediction will be discussed.

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00:29:00

Future Accelerators for Astro-Particle Physics

by Carlo Rubbia
Future Accelerators for Astro-Particle Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 861 views
Rating:

One of the most remarkable results of astro-particle Physics has been the success of the Standard Model, recently culminated in the discovery of the Higgs particle (Ho). However, the Ho is observable only in few channels at the LHC, in the presence o....

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00:35:00

The International Year of Light: Celebrating Fifty Years of Laser Revolution in Physics

by Serge Haroche
The International Year of Light: Celebrating Fifty Years of Laser Revolution in Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 838 views
Rating:

The year 2015 has been named the International Year of Light, to mark milestones in the science of light which occurred 1000, 200, 150, 100 and 50 years go. I was a young student in physics in 1965, when the cosmic radiation background was discovered....

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00:39:00

Light Quanta and Their Idiosyncrasies

by Roy Glauber
Light Quanta and Their Idiosyncrasies
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 1027 views
Rating:

Maxwell's electromagnetic theory (now 150 years old) seemed in its comprehensive way to be capable of answering all of the questions one might ever pose about the theory of light. But that spell was broken in 1900 by Planck's discovery that light bea....

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00:31:00

Quantum Information: a Scientific and Technological Revolution for the 21st Century

by William Phillips
Quantum Information: a Scientific and Technological Revolution for the 21st Century
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 793 views
Rating:

Two of the great scientific and technical revolutions of the 20th century were the discovery of the quantum nature of the submicroscopic world, and the advent of information science and engineering. Both of these have had a profound effect not only o....

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00:35:00

Science with Combs of Light

by Theodor Hänsch
Science with Combs of Light
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 1025 views
Rating:

The spectrum of a frequency comb, commonly generated by a mode-locked femtosecond laser, consists of several hundred thousand precisely evenly spaced spectral lines. Such laser frequency combs have revolutionized the art of measuring the frequency of....

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00:33:00

The Origin of Elementary Particle Masses

by Francois Englert
The Origin of Elementary Particle Masses
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 766 views
Rating:

In the beginning of the 60s, the laws of classical general relativity, Einstein's generalisation of Newtonian gravity, and of quantum electrodynamics, the quantum version of Maxwell's electromagnetic theory, were known. These laws describe long range....

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00:28:00

Optical Microscopy – the Resolution Revolution

by Stefan Hell
Optical Microscopy – the Resolution Revolution
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 782 views
Rating:

Throughout the 20th century it was widely accepted that a light microscope relying on conventional optical lenses cannot discern details that are much finer than about half the wavelength of light (200-400 nm), due to diffraction. However, in the 199....

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01:03:00

The Long Road to the Higgs Boson – and Beyond

by John Ellis
The Long Road to the Higgs Boson – and Beyond
for 14-19 and upwards,
Lectures | 14-19 and upwards | 5 years ago | 0 views
Rating:

The discovery of the Higgs boson at CERN’s LHC accelerator in 2012 by the ATLAS and CMS collaborations was the culmination of a decades-long search that had started in 1964 with the proposal of this unique particle, a signature of the origin of the....

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00:48:00

Density Functional Theory: three non-technical explanations

by Stefaan Cottenier
Density Functional Theory: three non-technical explanations
for 18-22 and upwards,
Lectures | 18-22 and upwards | 5 years ago | 1129 views
Rating:

What do six brides have to do with Density-Functional Theory? Discover it in this lecture, in which the essential ideas behind DFT are explained in three different non-technical ways. After this practical lecture, you will be able to understand the m....

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00:29:00

hyperfine interactions

by Stefaan Cottenier
hyperfine interactions
for 14-19 and upwards,
Lectures | 14-19 and upwards | 6 years ago | 2138 views
Rating:

30-minute lecture about the physics of hyperfine interactions, and about how to calculate hyperfine interactions by the WIEN2k DFT code

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01:04:00

Communicating with light

by Polina Bayvel
Communicating with light
for 14-19 and upwards,
Lectures | 14-19 and upwards | 6 years ago | 906 views
Rating:

Most of the data we generate and receive (whether emails, tweets, videos or mobile calls) are now carried by optical fibres, which use light to transmit vast quantities of information over trans-oceanic distances. The use of hundreds of wavelengths ....

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00:31:00

From Millisecond to Attosecond Laser Pulses

by Nicolaas Bloembergen
From Millisecond to Attosecond Laser Pulses
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1053 views
Rating:

A historical overview is presented of the experimental development of ever shorter laser pulses from 1960 to the present. Already in the early sixties nanosecond pulses were achieved and the entry into the picosecond domain was reached in the late s....

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00:25:00

Role of Cortical Noise in Vision

by Donald Glaser
Role of Cortical Noise in Vision
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 649 views
Rating:

Our brains are always generating electrical signals, even if we close our eyes, plug our ears, and lie in a warm bath. These signals are called cortical noise because they don't correlate with any sensation or thought of which we are aware. I will ....

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00:36:00

The Individuality of Light Quanta

by Roy Glauber
The Individuality of Light Quanta
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 952 views
Rating:

Light quanta are the fundamental units of radiant energy. When propagating freely they travel at the fastest attainable speed and live forever. These properties recommend them as the ideal messengers for communication of all sorts. Ordinary light ....

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00:27:00

Which Way For Physics?

by Brian Josephson
Which Way For Physics?
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 718 views
Rating:

This talk describes a new approach to the problem of characterising physical reality, one with the potential to fill in gaps in the conventional understanding of nature. It is based on a different view from the usual one of structure at the finest l....

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00:32:00

What Future for Energy and Climate?

by Jack Steinberger
What Future for Energy and Climate?
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 705 views
Rating:

We are using the planet's fossil fuel resources in a time which is very short compared to that of human evolution. In the same process we are changing the planet's climate and sea level, threatening the future of large segments of the global populat....

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00:30:00

The Development of Particle Physics

by Martinus Veltman
The Development of Particle Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 952 views
Rating:

Particle physics mainly developed after World War II. It has its roots in the first half of the previous century, when it became clear that all matter is made up from atoms, and the atoms in turn were found to contain a nucleus surrounded by electro....

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00:29:00

Discovery of Superconducting Tunneling

by Ivar Giaver
Discovery of Superconducting Tunneling
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1167 views
Rating:

I had the great fortune to receive a Nobel Prize in Physics for using electron tunneling to measure the energy gap in superconductors. In this talk I will recollect some of the events that led to this discovery and hopefully I will be able to convey....

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00:32:00

The Optical Frequency Comb – a Really Versatile Tool

by John Hall
The Optical Frequency Comb – a Really Versatile Tool
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 927 views
Rating:

The Optical Frequency Comb concept and technology exploded in 1999-2000 from the synthesis of advances in independent fields of Laser Stabilization, UltraFast Lasers, and NonLinear Optical Fibers. The Comb was developed first as a method for optical....

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00:29:00

Towards a Quantum Laboratory on a Chip

by Theodor Hänsch
Towards a Quantum Laboratory on a Chip
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 702 views
Rating:

Microfabricated magnetic traps, waveguides, and other elements for the manipulation of ultracold atoms can be combined to form a quantum laboratory on a chip. Devices such as miniaturized atom lasers, atom interferometers, and atomic clocks have been....

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00:33:00

Cold Atomic Gases: the Intersection of Condensed Matter and Atomic Physics

by William Phillips
Cold Atomic Gases: the Intersection of Condensed Matter and Atomic Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1053 views
Rating:

During the past decade laser cooling and evaporative cooling of atoms have produced quantum degenerate gases both of bosons (Bose-Einstein condensates) and of fermions (gases with temperatures below the Fermi temperature). Such gases can provide ana....

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00:34:00

From Spinwaves to Giant Magnetoresistance (GMR) and Beyond

by Peter GrŸnberg
From Spinwaves to Giant Magnetoresistance (GMR) and Beyond
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 886 views
Rating:

Standing spinwaves and surface waves in layered magnetic structures can be used for the detection and quantitative evaluation of interlayer exchange coupling (IEC). Using this method antiferromagnetic IEC has been found in Fe/Cr/Fe layered structure....

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00:37:00

Cosmic Rays: the Most Energetic Particles in the Universe

by James Cronin
Cosmic Rays: the Most Energetic Particles in the Universe
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 807 views
Rating:

Astrophysical objects are able to accelerate atomic nuclei to energies 10^7 times more than man made accelerators such as LHC. _Particles arrive at earth from space with energies as great as 50 joules, a macroscopic energy in a microscopic particle.....

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00:39:00

The World of Spintronics: Electrons, Spins, Computers and Telephones

by Albert Fert
The World of Spintronics: Electrons, Spins, Computers and Telephones
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 744 views
Rating:

Spintronics is a new field of research which exploits the influence of the electron spin on electronic transport. It is well known for the giant magnetoresistance of the magnetic multilayers and its application to increase the capacity of the hard d....

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00:32:00

The Big Challenges

by Gerardus t'Hooft
The Big Challenges
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 764 views
Rating:

During the entire 20th century, physical sciences have advanced to such a degree that we can extrapolate how they can be applied, even in a fairly distant future.  Even if we leave open the (likely) possibility of spectacular new discoveries and inv....

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00:34:00

Frontiers of Physics

by David Gross
Frontiers of Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1133 views
Rating:

David discusses a few of the questions facing fundamental physics that might be answered before the 100th Lindau meeting in 2050.

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00:32:00

The Looming World Shortage of Helium

by Robert Richardson
The Looming World Shortage of Helium
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 648 views
Rating:

The worldÍs supply of Helium gas comes primarily from alpha decay in rocks. The most abundant supply is in the American Southwest where it is trapped with methane is natural gas wells. That supply is estimated to last a mere 25 years. It took 4.7 bi....

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00:28:00

The History of the Universe, from the Beginning to the Ultimate End

by John Mather
The History of the Universe, from the Beginning to the Ultimate End
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 768 views
Rating:

John summarizes the history of the universe, from the Big Bang through the formation of galaxies and the Solar System, and the history of the Earth and some of the special factors enabling the formation of life.  Our future will be hot as the Sun ge....

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01:18:00

What is Quantum Optics?

by Roy Glauber
What is Quantum Optics?
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 2925 views
Rating:

The image of light waves as oscillating electromagnetic fields explains virtually all the phenomena of traditional optics.  An awareness that these waves are somehow subdivided into quanta has however been with us since the early 20th century.  The....

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00:43:00

The Development of Particle Physics

by Martinus Veltman
The Development of Particle Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 822 views
Rating:

Particle physics mainly developed after World War II. It has its roots in the first half of the previous century, when it became clear that all matter is made up from atoms, and the atoms in turn were found to contain a nucleus surrounded by electro....

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01:04:00

Mapping the Universe and Its History

by George Smoot
Mapping the Universe and Its History
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1500 views
Rating:

Using our most advanced techniques and instruments we sift through study the cosmic microwave background as a relic of the early universe to understand the events surrounding the birth and subsequent development of the Universe.  A precision inspect....

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00:34:00

What Can We Do with Laser Frequency Combs?

by Theodor Hänsch
What Can We Do with Laser Frequency Combs?
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 987 views
Rating:

The spectrum of a frequency comb, commonly generated by a mode-locked femtosecond laser consists of several hundred thousand precisely evenly spaced spectral lines.  Such laser frequency combs have revolutionized the art measuring the frequency of l....

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00:27:00

Model Synthesis for Ceramics: Superconductors, Magnets and Others

by Karl Muller
Model Synthesis for Ceramics: Superconductors, Magnets and Others
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 923 views
Rating:

The discovery of superconductivity in hole doped La2CuO4 was motivated by the interest to find this phenomenon in an oxide.  After the discovery near 35 K, copper oxides with transition temperatures of up to 131 K at normal pressure were found, i.e.....

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00:30:00

Superposition, Entanglement, and Raising Schrödinger’s Cat

by David Wineland
Superposition, Entanglement, and Raising Schrödinger’s Cat
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1455 views
Rating:

In 1935, Erwin Schrödinger, one of the inventors of quantum mechanics, illustrated his discomfort with the theory by pointing out that its extension to the macroscopic world could lead to bizarre situations such as a cat being simultaneously alive a....

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00:31:00

Controlling Photons in a Box and Exploring the Quantum to Classical Boundary

by Serge Haroche
Controlling Photons in a Box and Exploring the Quantum to Classical Boundary
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1266 views
Rating:

The founders of quantum theory assumed in 'thought experiments' that they were manipulating isolated quantum systems, obeying the counterintuitive laws which they had just discovered.  Technological advances have recently turned these virtual experi....

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00:30:00

Powering the Future

by Robert Laughlin
Powering the Future
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 970 views
Rating:

Some seeds of what to do in the climate/energy controversy are contained in what will be.  In this talk I shall ask everyone to jump over contemporary politics and make a mental journey to a time, several centuries from now, when nobody uses carbon-....

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00:33:00

Spontaneous Ionization to Subatomic Physics: Some Vignettes from Cosmic Ray History

by James Cronin
Spontaneous Ionization to Subatomic Physics: Some Vignettes from Cosmic Ray History
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 745 views
Rating:

In 1879 Crookes discovered that air seemed to ionize spontaneously.  With the discovery in 1896 of radioactivity by Henri Becquerel it appeared that the mystery was solved.  However a number of physicists sought a quantitative agreement between the....

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00:34:00

The Quantum Mechanics of Light: Interference, Entanglement – and Ghosts

by Roy Glauber
The Quantum Mechanics of Light: Interference, Entanglement – and Ghosts
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1040 views
Rating:

The early days of the quantum theory presented many dilemmas connected with interference phenomena and what we have come to call the entanglement of states. We are much better able to deal with these problems now, both in theory and experiment, but t....

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00:31:00

Five Decades of Lasers, Six Decades of Progress, and a Proposed Space Experiment to test Einstein’s Assumptions

by John Hall
Five Decades of Lasers, Six Decades of Progress, and a Proposed Space Experiment to test Einstein’s Assumptions
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 854 views
Rating:

Even though this is the 51st year of the Laser, progress in its control and application in precision measurements is still accelerating.  The Optical Frequency Comb technology exploded in 1999-2000 from the synthesis of advances in independent field....

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00:31:00

Laser Spectroscopy of Hydrogen

by Theodor Hänsch
Laser Spectroscopy of Hydrogen
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1039 views
Rating:

The simple Balmer spectrum of atomic hydrogen has provided the Rosetta stone for deciphering the strange laws of quantum physics during the early 20th century.  Four decades ago, Doppler-free laser spectroscopy opened a new chapter in the exploratio....

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00:33:00

A Century of Quantum Mechanics

by David Gross
A Century of Quantum Mechanics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1471 views
Rating:

In October 2011 we celebrated the centenary of the Solvay conferences that played a unique and important role in the development of twentieth century physics, most notably in the quantum revolution whose birth overlapped the initiation of these meeti....

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00:30:00

The Real M-Theory

by Brian Josephson
The Real M-Theory
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 813 views
Rating:

How can one advance a working hypothesis that will not be wrong tomorrow and ridiculous the day after? Beyond the Standard Model we find uncertainty and confusion, with both unclarity as to which might be the correct theory, as well as little in the ....

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00:31:00

Creating Artificial Magnetic Fields to Act on Neutral Atoms

by William Phillips
Creating Artificial Magnetic Fields to Act on Neutral Atoms
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 1080 views
Rating:

Cold, quantum degenerate gases of neutral atoms have proved to be useful in simulating the behavior of quantum systems like electrons in solids.  For example, cold atoms moving in optical lattices (periodic potentials created by interfering laser be....

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00:31:00

Neutrinos: a Golden Field for Astroparticle Physics

by Carlo Rubbia
Neutrinos: a Golden Field for Astroparticle Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 804 views
Rating:

Neutrinos have been the origin of an impressive number of ‘surprises’.  We know that neutrinos have tiny masses and that oscillations are occurring spontaneously between neutrino species.  But additional new discoveries may be ahead of us and t....

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00:34:00

The LHC at CERN and the Higgs

by Martinus Veltman
The LHC at CERN and the Higgs
for 18-22 and upwards,
Lectures | 18-22 and upwards | 6 years ago | 957 views
Rating:

The strong interactions, the forces responsible for the interactions between quarks and notably supposedly responsible for quark confinement, profited from the development of gauge theories.  In the wake of the gauge theory of weak interactions also....

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00:08:00

Longboard data analysis

by Jonathan Hare
Longboard data analysis
for 14-19 and upwards,
Lectures | 14-19 and upwards | 7 years ago | 1412 views
Rating:

Using a data-logger to analyse the performance of a longboard.

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00:04:00

Longboard physics

by Jonathan Hare
Longboard physics
for 14-19 and upwards,
Lectures | 14-19 and upwards | 7 years ago | 6319 views
Rating:

A few (surprising?) thoughts on how the wheels on a longboard or skateboard actually move.

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00:07:00

The Longboard – speedometer

by Jonathan Hare
The Longboard – speedometer
for 14-19 and upwards,
Lectures | 14-19 and upwards | 7 years ago | 1504 views
Rating:

Jonathan describes his adventures with a longboard and some different methods of making a speedometer for it.

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00:05:00

Wave Power

by Jonathan Hare
Wave Power
for 11-14 and upwards,
Lectures | 11-14 and upwards | 7 years ago | 1198 views
Rating:

The UK coast is constantly being bombarded by sea waves.  There is a massive amount of power available from these waves.  Jonathan describes three different ways of generating electrical power from water waves.

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00:03:00

How does a transistor work?

by Jonathan Hare
How does a transistor work?
for 11-14 and upwards,
Lectures | 11-14 and upwards | 7 years ago | 1852 views
Rating:

A short video explaining how transistors work.  At the heart of our high-tech society with radios, mobile phones, computers and space exploration are tiny electronic components called transistors.  They have revolutionised electronics and in the pr....

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00:06:00

Solar Cells

by Jonathan Hare
Solar Cells
for 11-14 and upwards,
Lectures | 11-14 and upwards | 7 years ago | 5496 views
Rating:

A short video on solar cells explaining with accompanying information sheet. How they work and how Jonathan uses solar power at home.

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00:06:00

Simple Electrical Generator

by Jonathan Hare
Simple Electrical Generator
for 11-14 and upwards,
Lectures | 11-14 and upwards | 7 years ago | 1134 views
Rating:

With some simple circuitry and a homemade hand powered generator Jonathan makes AC and DC electricity that could be used for charging a mobile phone or attaching to a wind turbine.

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00:09:00

Paper Windmills

by Jonathan Hare
Paper Windmills
for 11-14 and upwards,
Lectures | 11-14 and upwards | 7 years ago | 2829 views
Rating:

Jonathan makes some simple paper windmills/turbines and experiments with a simple generator to power house hold devices such as torches, calculators and even a radio.

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00:04:00

Mobile Phone

by Jonathan Hare
Mobile Phone
for 11-14 and upwards,
Lectures | 11-14 and upwards | 7 years ago | 1323 views
Rating:

Jonathan shows us with a cheap and simple homemade demonstration how your mobile telephone generates radio waves in order for you to use it to communicate.  As you will see you can use this method to explore many aspects of your mobile phone!

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00:04:00

Electrical Generator

by Jonathan Hare
Electrical Generator
for 11-14 and upwards,
Lectures | 11-14 and upwards | 7 years ago | 1105 views
Rating:

This short video shows one of the demonstrations for the Physics SEPNet exhibition - "Who will keep the lights on?" which travelled around the southern UK from February 2009.  We describe and explain the electrical generator demonstration which Jona....

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00:05:00

The Fresnel Lens

by Jonathan Hare
The Fresnel Lens
for 14-19 and upwards,
Lectures | 14-19 and upwards | 7 years ago | 982 views
Rating:

Early lighthouses used coil and wood fires before moving on to gas and then electricity powered lights.  Massive improvements took place by using a lens system around the light.  The development of the Fresnel lens brought what we now regard as the....

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01:00:00

A Little Light Relief

by David Phillips
A Little Light Relief
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 1444 views
Rating:

Light, particularly sunlight, is believed to be good for our health. Many ancient civilisations even attributed it with mystical healing powers.Renowned for his entertaining lectures, Professor David Phillips, President of the RSC, uses his expertise....

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01:15:00

The Nuclear Debate

by Various Presenters
The Nuclear Debate
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 1205 views
Rating:

New carbon targets requires reducing emissions of greenhouse gases by 50% for 2030. This house believes that it will be impossible to meet the emissions reductions required to fulfil these obligations without the use of nuclear power.  Taking the pr....

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00:21:00

Force or (potential) energy

by Slobodan Danko Bosanac
Force or (potential) energy
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1271 views
Rating:

Classical dynamics uses the concept of force for its solution. On the other hand force in quantum dynamics has no meaning and the concept of potential energy is used instead. The question is, "which one of the concepts is more fundamental?".

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00:45:00

Modern Physics

by Leonard Susskind
Modern Physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1119 views
Rating:

A series of nine lectures from Leonard Susskind who is the Felix Bloch Professor of Theoretical Physics atStanford University, and Director of the Stanford Institute for Theoretical Physics.

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00:51:00

Music, architecture and acoustics in Renaissance Venice: Recreating lost soundscapes

by Malcolm Longair
Music, architecture and acoustics in Renaissance Venice: Recreating lost soundscapes
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 1271 views
Rating:

During the Renaissance in Venice, composers such as the Gabrieli and Moneverdi created some of their greatest masterpieces for performance in the great churches on festive occasions. But what would the music have sounded like, given its complexity an....

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00:58:00

The Centenary of the Discovery of Cosmic Rays: the End of the Beginning

by Arnold Wolfendale
The Centenary of the Discovery of Cosmic Rays: the End of the Beginning
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 1005 views
Rating:

Sir Arnold Wolfendale FRS is Emeritus Professor of Physics at the University of Durham, and former Astronomer Royal. In 1912, Victor Hess embarked on a perilous balloon ascent and discovered the 'Cosmic Radiation', actually a beam of atomic particles....

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01:02:00

The search for a deeper understanding of our universe at the Large Hadron Collider

by Rolf-Dieter Heuer
The search for a deeper understanding of our universe at the Large Hadron Collider
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 980 views
Rating:

With the start of the Large Hadron Collider (LHC) at CERN, particle physics entered a new era. The LHC will provide a deeper understanding of the universe and the insights gained could change our view of the world, and the lecture will present some o....

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01:04:00

Busy, Busy – all day long we’re in a whirl

by Tim Richardson
Busy, Busy – all day long we’re in a whirl
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1319 views
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An unusual look at the effects that things rotating have on our everyday life.

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00:12:00

The eye and colour vision

by Joe Wolfe
The eye and colour vision
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 1996 views
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The physics of the eye, its performance and colour vision: refraction and accommodation; photoreceptors and resolution; compromises in visual performance.

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00:11:00

Geometrical optics

by Joe Wolfe
Geometrical optics
for 14-19 and upwards,
Lectures | 14-19 and upwards | 8 years ago | 1219 views
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On scales much bigger than the wavelength, rays explain the behaviour of interfaces, mirrors, lenses, optical instruments, including telescopes and microscopes.

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00:12:00

The nature of light

by Joe Wolfe
The nature of light
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 1069 views
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White light comprises colours in the visible spectrum. The electromagnetic spectrum. Speed of light. Young's experiment and waves. Quanta and photons.

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00:11:00

Human Sound

by Joe Wolfe
Human Sound
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 1620 views
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Sound is produced in the larynx; filtering it in the vocal tract produces formants and phonemes. The acoustics, mechanics and some neurobiology of hearing. Pitch perception.

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00:09:00

Standing waves

by Joe Wolfe
Standing waves
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 1535 views
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Reflecting waves gives standing waves, which can be resonances. Standing waves on strings and in pipes and plates.

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00:08:00

Interference and consonance

by Joe Wolfe
Interference and consonance
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1308 views
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Superposing waves with different frequencies gives beats and Tartini tones. Removing beats gives consonance. Tuning consonances gives temperament.

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00:09:00

Quantifying sound

by Joe Wolfe
Quantifying sound
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1367 views
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Frequency, amplitude, envelope and spectrum affect pitch, loudness and timbre. All are discussed and quantified here.

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00:17:00

How can we see atoms ?

by John Rodenburg
How can we see atoms ?
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1013 views
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Seeing atoms using electons rather than lenses

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00:10:00

The Doppler effect

by Joe Wolfe
The Doppler effect
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1679 views
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Moving either source or receiver produces a frequency shift called the Doppler effect, which we measure and analyse.

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00:53:00

Importance of Physics in Industry

by Phillip Wyatt
Importance of Physics in Industry
for All ages,
Lectures | All ages | 10 years ago | 4055 views
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00:09:00

Sound

by Joe Wolfe
Sound
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1197 views
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Sound is a longitudinal wave of variations in pressure and density. We derive and measure its speed.

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00:06:00

Travelling waves II

by Joe Wolfe
Travelling waves II
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1267 views
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The wave equation and its physical origin. Power in a wave and its relation to intensity in radiation.

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00:07:00

Travelling waves I

by Joe Wolfe
Travelling waves I
for 14-19 and upwards,
Lectures | 14-19 and upwards | 10 years ago | 1355 views
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In an extended medium, inertia and a restoring force can lead to waves, which reflect at boundaries, either erect or inverted.

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00:09:00

Oscillations

by Joe Wolfe
Oscillations
for 14-19 and upwards,
Lectures | 14-19 and upwards | 11 years ago | 1016 views
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Inertia and restoring forces can, with low friction or damping, lead to oscillations and resonance. We analyse the mechanics of vibrations.

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00:12:00

Gravity

by Joe Wolfe
Gravity
for 14-19 and upwards,
Lectures | 14-19 and upwards | 11 years ago | 1197 views
Rating:

The inverse square law explains planetary motion - and apples falling. Newton's law, measuring G, calculating orbits.

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01:03:00

Plastic fantastic: electronics for the 21st century

by Richard Friend
Plastic fantastic: electronics for the 21st century
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 1046 views
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Plastics - or, more correctly, polymers have traditionally been used by the electronics industry as passive materials. Now however, new types of polymers have been discovered which behave as semiconductors. For example, they can emit light when subje....

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01:00:00

The mesoscopic world – from plastic bags to brain disease.

by Athene Donald
The mesoscopic world – from plastic bags to brain disease.
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 1104 views
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Structures looking broadly the same in the optical microscope are found in starch granules within plants, in polythene bags and in sections of diseased brain tissue. Athene Donald explores structural similarities between different assemblies of polym....

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01:12:00

The quandary of the quark

by Christine Davies
The quandary of the quark
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 1015 views
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99.9% of the visible material in the universe is made of quarks and yet we know surprisingly little about them. Professor Davies describes how the properties of the quark are now being revealed, and the implications that this will have for our unders....

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01:08:00

Optical science in the fast lane

by Wileon Sibbett
Optical science in the fast lane
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 1020 views
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In this talk Wilson Sibbett introduces some of the underlying concepts that have enabled us to develop practical ultrafast lasers and a selection of applications that range from the fundamentals of chemical bonding to weapons decommissioning!

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00:56:00

Einstein’s legacy as scientist and icon

by Martin Rees
Einstein’s legacy as scientist and icon
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 923 views
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What might 'new Einsteins' achieve in the 21st century? Science offers more intellectual challenges than ever, but is a less individualistic enterprise. Technology offers imense opportunities, but poses threats and ethical dilemmas. Can scientists re....

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01:12:00

What is quantum non-locality?

by Sandu Popescu
What is quantum non-locality?
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 1102 views
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In his talk Sandu will explain this quantum non-locality and present some of the uses of non-locality for quantum information and communication - strange effects such as teleportation - and will discuss the implications of non-locality for understand....

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00:41:00

Particle Physics and the Mysteries of the Early Universe

by Cristina Lazzeron
Particle Physics and the Mysteries of the Early Universe
for 14-19 and upwards,
Lectures | 14-19 and upwards | 11 years ago | 1018 views
Rating:

Dr Cristina Lazzeroni, a Royal Society University Research Fellow from the University of Birmingham, reveals the secrets of the world's largest accelerator, the Large Hadron Collider and how the LHC experiments hope to answer big questions about the ....

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01:10:00

The LHC: largest experiment and smallest particles

by Tara Shears
The LHC: largest experiment and smallest particles
for 14-19 and upwards,
Lectures | 14-19 and upwards | 11 years ago | 1030 views
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The LHC is the most powerful particle accelerator ever built. It is capable of recreating the very energetic conditions last seen in the universe a billionth of a second after the Big Bang, and allows particle physicists to study the fundamental ingr....

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01:16:00

Every picture tells a story

by John Barrow
Every picture tells a story
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 980 views
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We will look at the role of pictures and images in the development of science. From the first graphs and illustrated books to Molscript, the influence of the first pictures of spiral galaxies on Van Gogh's 'Starry Night', to the artistic resonances o....

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01:03:00

Taming the Quanta

by Martin Plenio
Taming the Quanta
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 1185 views
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Devices are now reaching the realm where individual structures are made up of only a few atoms so that quantum mechanics, the theory of the very small, is playing a crucial role. The inevitable quantum fluctuations produce noise which was initially e....

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01:01:00

The uses of infinity: a philosopher looks at emergent phenomena in physics

by Jeremy Butterfield
The uses of infinity: a philosopher looks at emergent phenomena in physics
for 18-22 and upwards,
Lectures | 18-22 and upwards | 11 years ago | 742 views
Rating:

Emergence, and its contrary, reduction, are buzz-words in both physics and philosophy. Both physicists and philosophers disagree about the extent to which we can understand large-scale or complex phenomena in terms of their microscopic parts.

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00:10:00

Rotation

by Joe Wolfe
Rotation
for 14-19 and upwards,
Lectures | 14-19 and upwards | 11 years ago | 1046 views
Rating:

Torques produce angular acceleration, moment of inertia 'resists' it. Rotational kinetic energy and angular momentum.

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