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An engine whistling at a constant freque...

An engine whistling at a constant frequency `n_0` and moving with a constant velocity goes past a stationary observer. As the engine crosses him, the frequency of the sound heard by him changes by a factor f. The actual difference in the frequencies of the sound heard by him before and after the engine crosses him is

A

`(1)/(2) n_0 (1-f^2)`

B

`(1)/(2) n_0 ((1-f^2)/(f))`

C

`n_0 ((1-f)/(1+f))`

D

`(1)/(2) n_0 ((1-f)/(1+f))`

Text Solution

Verified by Experts

The correct Answer is:
B
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