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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

286 cps

B

292 cps

C

294 cps

D

288 cps

Text Solution

Verified by Experts

The correct Answer is:
B
`n_A=`Known frequency `=288cps,n_B=?x=4bps` which decreasing (from 4 to 2) after loading i.e,`xdarr` Unknown fork is loaded so `n_Bdarr`
Hence `n_A-n_Bdarr=xdarr`wrong
`n_Bdarr-n_Adarr=xdarr`correct
`impliesn_B=n_A+x=288+4=292Hz`
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