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This applet demonstrates several superpositions of simple wave forms. The waves can be rectangular, elliptical, square or a triangle. A basic site which gives a basic understanding of the principle ...
Useful information driven site which provides details on both how light can be considered a wave and the relationship between waves and colour.
Minutephysics looks at how polarised light in the cosmic microwave background (CMB) gave rise to the discovery of gravitational waves.
Gravitational potential energy is energy an object possesses because of its position in a gravitational field.
A great site about Einstein's ideas with lots of information on special and general relativity, cosmology, gravitational waves, black holes.
An animation to illustrate the propagation of sound waves from a moving source. You can modify the wave speed, the source speed and wavelength.
A new project from Zooniverse looks to track gravitational lenses in images. Here's the science behind how they happen.
This site has good detail on light and sound waves.
This site is rather complex to use but allows users to set up two waves of a certain amplitude, frequency and wavelength and add them together.
Animations which demonstrate both types of wave and illustrate the difference between the motion of the wave and the motion of the particles in the medium through which the wave is travelling.
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