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A tuning fork sounded together with a tu...

A tuning fork sounded together with a tuning fork of frequency 256 emits two beats. On loading the tuning fork of frequency 256, the number of beats heard are 1 per second. The frequency of tuning fork is

A

257

B

258

C

256

D

254

Text Solution

Verified by Experts

The correct Answer is:
D
Let `n_(A)` = Known frequency = 256 Hz beat frequency `beta = 2 Hz`, which is decreasing after loading turning fork A.
Thus we use
`n_(A) - n_(B) = beta`
implies `256 - n_(B) = 2`
implies `n_(B) = 254 Hz`
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