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When two tunning forks A and B are soun...

When two tunning forks A and B are sounded together , 4 beats per second are heard . 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
`v_(A) = V_(B) pm 4 `
`v_(A) = 384 pm 4 = 380 Hz` or 388 Hz
When the prongs of tunning fork A are filed then frequency of tunning fork increases and hence beat frequency will increase if `v_(A) ` = 388 Hz. So correct choice is (a).
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