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

Options

(a) 328 Hz
(b) 316 Hz
(c) 324 Hz
(d) 320 Hz

Correct Answer:

316 Hz

Explanation:

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