Question

What is Doppler's effect? Write down expression for apparent frequency when source is in motion and
listener is at rest.
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Answer 1

Answer:

Doppler Effect refers to the change in wave frequency during the relative motion between a wave source and its observer.

Explanation:

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Answer 2

explanation:Doppler effect is the phenomenon of apparent change in frequency of sound heard by the listener when there is a relative motion between source listener and the medium