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when a source of sound of frequency f cr...

when a source of sound of frequency f crosses stationary observer with a speed ` v_(s) (lt lt ` speed of sound v) , the apparent change in frequency ` Dealtaf` is given by

A

`(2fv_(s))/v`

B

`2fs v_(s)`

C

`(2fv_(s))/v_(s)`

D

`(fv_(s))/v`

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The correct Answer is:
A
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