Doppler effect Hear it!

Doppler effect definition

Dop·pler effect (däp′lər)

the apparent change of frequency of sound waves or light waves, varying with the relative velocity of the source and the observer: if the source and observer are drawing closer together, the observed frequency is higher than the emitted frequency

Etymology: after C. Doppler (1803-53), Austrian mathematician and physicist

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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