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The source (S) of sound is moving consta...

The source (S) of sound is moving constant velocity `v_(0)` as shown in diagram. An observer O listens to the sound emmited by the source. The observed frequency of the sound

A

continuously decreases

B

continuously increases

C

first decreases then increases

D

first increases then decreases.

Text Solution

Verified by Experts

The correct Answer is:
A
From figure, the velocity of approach `(V cos theta)` decreases as the source comes closer (as `theta` increases). And the velocity of separation also increases as `phi` will decreases. Hence the frequency of should as heard by the observed decreases continuously.
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