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Image | Theory | Video | Short description
|  |  | Waves on the surface of the water are neither longitudinal nor transversal one. Small red ball simulating the molecule moves on the circular path.
|  |  | Standing wave. Interference between two linear waves.
|  |  | Interference between the waves from two coherent point sources.
|  |  | Propagation of linearly polarized electro-magnetic wave.
|  |  | Two modes of oscillation in crystals. Phonons.
|  |  | Generation of acoustic wave by loudspeaker.
|  |  | Doppler effect in acoustics. The frequency of the signal is changed if the source and receiver move relatively each other.
|  |  | Fourier Series. Animation shows the sum of the first 10 harmonics of meander.
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