Sound WavesHard

Question

A siren emitting sound of frequency 800 Hz is gong away from a static listener with a speed of 30m/s frequency of the sound to be heard by the listener is (Take velocity of sound = 300m/s)

Options

A.286.5Hz
B.481.2 HZ
C.733.3 Hz
D.644.8 Hz

Solution

Since, the source is going away from listener
    n′ = n ′ 800 ×
    n′ = 800 × = 733.33 Hz

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