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Q.

A railway engine moving with a speed of 60m/sec passes in front of a stationary listener. The real frequency of the whistle is 400Hz. Calculate the apparent frequency heard by the listener when the engine is approaching the listner Vs=340m/s

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a

480 Hz

b

485.7 Hz

c

420 Hz

d

440 Hz

answer is B.

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Detailed Solution

f1=fVV−VS=400340340−60=485.7Hz

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A railway engine moving with a speed of 60m/sec passes in front of a stationary listener. The real frequency of the whistle is 400Hz. Calculate the apparent frequency heard by the listener when the engine is approaching the listner Vs=340m/s