Doppler Effect (C.J. Doppler)
The apparent change in wavelength of
sound or light caused by the motion of the source, observer or both. Waves
emitted by a moving object as received by an observer will be blueshifted (compressed)
if approaching, redshifted (elongated)
if receding. It occurs both in sound and light. How much the frequency changes
depends on how fast the object is moving toward or away from the receiver.
Compare cosmological
redshift.
Source: wikipedia, NASA
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