What is the Dop­pler Ef­fect?

Science Illustrated - - ASK US -

The Dop­pler ef­fect is the change in fre­quency or wave­length of a wave for an ob­server, who is mov­ing rel­a­tive to the wave source. A very good ex­am­ple from ev­ery­day life is the way in which the sound of an am­bu­lance changes as it passes by.

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