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A train is moving with a constant speed ...

A train is moving with a constant speed along a circular track. The engine of the train emits a sound of frequency f. The frequency heard by the guard at the rear end of the train.

A

less than `f`

B

`equal to `f`

C

`is greater than `f`

D

may be greater than , less than or equal to depending on the factiors like speed of train, length of train and radius of circular track

Text Solution

Verified by Experts

The correct Answer is:
D
Suppose v be the speed of sound

`f.=f((v+v_(0)costheta)/(v+v_(0)costheta))=f((v+v_(0)costheta)/(v+v_(s)vcostheta))=f`
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