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A tuning fork A produces 4 beats per sec...

A tuning fork A produces 4 beats per second with another tuning fork B of frequency 320 Hz. On filing one of the prongs of A, 4 beats per second are again heard when sounded with the same fork B. Then the frequency of the fork A before filing is

A

256

B

254

C

261

D

251

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The correct Answer is:
D
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