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What physicist discovered that a wave's frequency changes when the source and the observer are in motion relative to one another?

Answer:

CHRISTIAN DOPPLER

Austrian physicist Christian Johann Doppler (1803-1853) discovered that a wave's frequency changes when the source and observer are in motion relative to one another. This is known as the Doppler effect.

Science Added May 23rd, 2019 by Kristiano Profile Picture Kristiano

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