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A tuning fork A produces 4 beat/s with a...

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

A

328 Hz

B

316 Hz

C

324 Hz

D

320 Hz

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