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The Doppler effect is the effect that is created when the frequency of waves from a source changes because the source is moving, relative to the place from where it is being observed, so either "squashing" (compressing) or "stretching" the wave.
It is the Doppler effect that is responsible for red shift (light waves) and also for the change in the sound of a siren as a police car passes (sound waves).
In both these cases, change in frequency means a change in the character of the wave (colour, pitch) so we see/hear something "different".
Anne Evans
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