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When a train approaches a stationary obs...

When a train approaches a stationary observer, the apparent frequency of the whistle is `n'` and when the same train recedes away from the observer, the apparent frequency is `n"`. Then the apperent frquency `n` when the observer sitting in the train is :

A

`n=(n'+n)/(2)`

B

`n=sqrt(n'n'')`

C

`n=(2n'n'')/(n'+n'')`

D

`n=(2n'n'')/(n'-n'')`

Text Solution

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The correct Answer is:
C
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