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Q.

A car travelling at a speed of 54 km/hr towards a large wall horns a sound of frequency 400 Hz if the person stands behind the car such that the car receding from him approaches the wall. The difference in frequencies of the two sounds one received directly from the car and the other reflected from the wall is (speed of sound is 335 m/s)

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a

30 Hz

b

35.9 Hz

c

20 Hz

d

70 Hz

answer is A.

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Detailed Solution

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Δn≈2nv0v=2×400×15335=35.8 Hz

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