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Two tuning forks, A and B, produce notes...

Two tuning forks, A and B, produce notes of frequencies 258 Hz and 262 Hz. An unknown note sounded with A produces certain beats. When the same note is sounded with B, the beat frequency gets doubled. The unknown frequency is

A

268 Hz

B

250 Hz

C

260 Hz

D

252 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
`|262-f|=|256-f|xx2`
`rArr (262-f)=pm(256-f)xx2`
`rArr f=250, 258 Hz`
Unknown frequency can no be greater than 262 Hz because no. of beats heard with 262 Hz is more then the no. beats heard with 256 Hz
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