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Two tunning forks A and B produce notes of frequencies 256 Hz & 262 Hz respectively. An unknown note sounded at the same time with A produce beats. When the note is sounded with B, beats frequency is twice as large. The unknown frequency could be

A

256 Hz

B

254 Hz

C

300 Hz

D

280 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
`n_(A)=258` Hz and `n_(B)=262` Hz
Let n is the frequency of unknown tuning fork. It produces x beats with 258 and 2x with 262,
`implies 262-(258-x) =2x`
`implies 262-268+x=2x`
`implies x=4`
`implies n=254 Hz`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-WAVE MOTION-Exercise 2
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