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A fixed source of sound emitting a certa...

A fixed source of sound emitting a certain frequency appears as `f_(a)` when the observer is apporoaching the source with `upsilon_(0)` and `f_(r)` when the observer recedes from the source with the same speed. The frequency of source is

A

`(f_(r) + f_(a))/(2)`

B

`(f_(a) - f_(r))/(2)`

C

`sqrt(f_(a)f_(r))`

D

`(2f_(r)f_(a))/(f_(r) + f_(a))`

Text Solution

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The correct Answer is:
A
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