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A train of length l is moving with a con...

A train of length `l` is moving with a constant speed v circular track of radius R, the engine of the train emits a whistle of frequency `f_(0)`. Find the frequency heard by a guard at the rear end of the train.

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The correct Answer is:
f
`f_("guard")=f_(o)((v+v_(s))/(v+v_(s)))=f_(o)`
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ALLEN -WAVES AND OSCILLATIONS-Part-1(Exercise-04)[A]
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  19. A train approaching a hill at a speed of 40 km//hr sounds a whistle of...

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