Q .     Two tuning forks `A` and `B` having frequency of `500Hz` each are placed with `B` to the right of `A`. An observer is between the forks and is moving towards `B` with a speed of `25 m//s`. The speed of sound is `345` m/s and the wind speed is `5` m/s from A to B. Calculate, the difference in the two frequencies heard by the observer.

UPSEE 2014
A

`72.5` Hz

B

`55.6` Hz

C

`76.2` Hz

D

`80.9` Hz

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