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The Doppler effect

An explanation of the Doppler effect, which occurs whenever the source of waves (eg sound) is moving with respect to an observer.

http://www.physicsclassroom.com/class/waves/u10l3d.cfm

An Example of the Doppler Effect

Java applet (part of a wider site) which illustrates the Doppler effect for sound, giving the example of a passing ambulance siren.

http://www.walter-fendt.de/ph14e/dopplereff.htm

Meissner Effect

Simple definition of the Meissner effect, as relating to superconducting material. Part of a larger site which includes many definitions and links.

http://hyperphysics.phy-astr.gsu.edu/hbase/solids/meis.html#c1

Photoelectric Effect

Simple demonstration of the photoelectric effect using different coloured filters to alter the frequency of light reaching a metal plate, and the current changes accordingly.

http://www.youtube.com/watch?v=kcSYV8bJox8

The Leidenfrost Effect (video)

The Leidenfrost effect explains why water sometimes 'rolls' off a hot plate or frying pan, and how some experts can dip their hands into liquid nitrogen or even molten lead without hurting themselves