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Interference between two waves (point source)

This java applet let you play with two point sources and watch the effect of interference. Wavelength can be changed and path length is shown.

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http://www.phy.ntnu.edu.tw/~hwang/waveInterference/waveInterference.html

Ripple

A mini applet showing interference patterns created by spherical sources. This simple applet allows you to change the position of the sources, add or delete sources and change their wavelength. ...

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http://webphysics.davidson.edu/Applets/Ripple/Ripple_JS.html

Moving Point source: Doppler effect and shock wave

An animation to illustrate the propagation of sound waves from a moving source. You can modify the wave speed, the source speed and wavelength.

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http://www.phy.ntnu.edu.tw/~hwang/Doppler/Doppler.html

Doppler Physlet

Vary the velocity and notice the wavelength shift ahead of and behind the source. A shock wave, i.e., sonic boom, can be seen to form if the speed of the source is comparable to the phase velocity.

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http://webphysics.davidson.edu/applets/Doppler/Doppler.html

Biot-Savart Law

The Biot-Savart Law relates magnetic fields to the currents which are their sources. In a similar manner, Coulomb's law relates electric fields to the point charges which are their sources.

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http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/biosav.html#c1

ISIS Pulsed Neutron & Muon Source

The homepage of the world's leading pulsed neutron source

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http://www.isis.rl.ac.uk/

Inverse Square Law

Any point source which spreads its influence equally in all directions without a limit to its range will obey the inverse square law. This comes from strictly geometrical considerations. The ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/forces/isq.html#isq