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The frequency of a train whistle is 360 Hz. As the train passes t}rough a station the frequency appears to be 400 Hz to a man who is standing on the station platform. If the speed of sound in air is 340 m/s, the speed of train is

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a

20m/s

b

34 m/s

c

36 m/s

d

39 m/s

answer is B.

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Detailed Solution

n′=VV−Vsn 400=340340−vs360 or 400×340−400Vs=340×360 or 340[400−360]=400vs 340×40400=vs Vs=34m/s

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