#### C60+ in space – a 28-year detective story about the Diffuse Interstellar Bands – Part 4

The early (mid 1990s) work on the electronic spectroscopy was carried out by John Maier's group, trapping C60+ in a neon matrix in this apparatus.

More details | Watch now#### C60+ in space – a 28-year detective story about the Diffuse Interstellar Bands – Part 3

John Maier's team at the University of Basel solved the riddle of C60+ in 2015. In this brief view Colin Byfleet looks at the unique apparatus used in John's work.

More details | Watch now#### Centripetal force – how do we measure it?

A short video showing a simple classroom method of checking the way in which this force is related to mass, speed and radius.

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A presentation showing both the ideas about centripetal force and a simple classroom method of checking the way in which this force is related to mass, speed and radius.

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A short clip showing the experimental measurement of the speed of electrical pulses in a cable - a large fraction of the speed of light.

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A presentation showing how to measure the speed of sound over a short distance on a laboratory table.

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An introduction to constructing and recognising chemical formulas. Using 20 well-known elements, the valency-rules which govern the atomic ratios are explained and used with several examples.

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An introduction into the writing down of fully balanced chemical equations. The process is explained starting with word equations, finding all the relevant formulas and then working with some useful rules for finding the correct coefficients in the b....

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The concept of oxidation and reduction is explained and generalised using oxidation numbers with ionic and covalent examples. Several equations are balanced, using the oxidation number method to fix various atomic ratios.

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The main problems associated with communicating with distant space probes like Voyager 1 are investigated. The role played by diffraction in limiting the amount of power receivable on Earth is discussed. The further problems of reaching a nearby st....

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A look at what was known when Newton started to develop his theory of gravitation and how he used these ideas and data to make his great forward step

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A survey of the variety and usefulness of the wide-ranging techniques which incorporate the name spectroscopy.

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