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When two tuning forks A and B are sounded together, 4 beats per second are head. The frequency of the fork B is 384 Hz. When one of the prongs of the fork A is filled and sounded with B, the beat frequency increases, then the frequency of the fork A is

A

388 Hz

B

389 Hz

C

380 Hz

D

379 Hz

Text Solution

Verified by Experts

The correct Answer is:
A
After filing `f_(A)uarr,f_("beat") uarr`
`f_(B)=384Hz` (given)
So, `f_(A)-f_(B)=f_("beat")` (Possible)
`f_(A)=388Hz`.
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