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A tuning fork arrangement (pair) produce...

A tuning fork arrangement (pair) produces `4 beats//sec` with one fork of frequency `288cps`. A little wax is placed on the unknown fork and it then produces `2 beats//sec`. The frequency of the unknown fork is

A

294

B

288

C

286

D

292

Text Solution

Verified by Experts

The correct Answer is:
D
The frequency of the unknown fork may be `288 + 4 or 288 - 4 or 292 Hz or 284 Hz`
If the unknown frequency is 284 Hz, then on applying the wax, it will decrease and then no. of beats/s, will increase. This is not possible.
But for n = 292 Hz, the frequency can be 290 and we can get 2 beats/s
`:.` 292 Hz is the unknown frequency
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