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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

389Hz

B

379Hz

C

388Hz

D

380Hz

Text Solution

Verified by Experts

The correct Answer is:
C
`v_(A) ~ v_(B)= 4 rArr v_(A) ~ 380 = 4 rArr v_(A)= 380 or 388Hz` On filing beat frequency increases frequency of increases
Hence `V_(A)= 388Hz`
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