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A tuning fork arrangement (pair) produce...

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

A

286 cps

B

292 cps

C

294 cps

D

288 cps

Text Solution

Verified by Experts

The correct Answer is:
b
The wax decreases the frequency of unknown fork. The possible unknown frequencies are `(288+4)cps and (288-4)cps`.
If wax reduces 284 cps then beats would increase. It is not given in the question. So, this frequency is ruled out. If wax reduces 292 cps and so beats would decrease. It is given that the beats decrease to 2 from 4.
Hence unknown fork has frequency 292 cps.
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