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Waves from a Moving Source in 3D
Below the wave speed, waves emitted from a moving source pile up in front and spread out behind, leading to a Doppler shift. Above the wave speed, waves accumulate at the sides, forming a conical shock wave. The sonic boom heard from a supersonic airplane occurs where the shock intersects the ground.




"Waves from a Moving Source in 3D" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/WavesFromAMovingSourceIn3D/
Contributed by: Stephen Wolfram
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