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Q.

A Siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s, frequency of the sound to be heard by the listener is (take velocity of sound as 330 m/s)

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a

733.3 Hz

b

544.8 Hz

c

481.2 Hz

d

986.5 Hz

answer is A.

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Detailed Solution

n′=nvv+vS=800330330+30=733.33Hz

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A Siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s, frequency of the sound to be heard by the listener is (take velocity of sound as 330 m/s)