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00:05:00
Light Beam
Light is reflected off a flexible shiny surface fixed to the end of a plastic tube. When one speaks into the tubes sound vibrations pass down the tube and make the surface vibrate. The reflected light is therefore sent off from the surface in a con....
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00:04:00
Temperature and States of Matter
00:10:00
Temperature Scales
John Murrell explains scales and colour changes with temperature, boiling and melting,
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