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Q.

A tuning fork A of unknown frequency produces 5 beats/s with a fork of known frequency 340Hz. When fork  A is filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A?

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a

338 Hz

b

335 Hz

c

345 Hz

d

342 Hz

answer is A.

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Detailed Solution

f=340±5-335 or 340Hz when fork A is filled, then beat frequency decreases to 2 beats/sIt is possible only when fA = 335

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