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When a tuning fork A and B are sounded t...

When a tuning fork A and B are sounded together,the number of beats heard are 4 per second.When tuning fork A is field,the number of beats heard per second with B is changed to 3.If the frequency of tuning fork B is 384 Hz,the original frequency of A is

A

388 Hz

B

387 Hz

C

381 Hz

D

380 Hz

Text Solution

Verified by Experts

The correct Answer is:
D
`n_(A) = 300 Hz`
`n_(B) = 384 +- 3 = 387 or 381`
After filling frequency increases before filling frequency decreases by difference of beat frequency
`:. n_(A)= 380`
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