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Two sound waves of wavelength 92/157 m a...

Two sound waves of wavelength 92/157 m and 92/155 m produce 8 beats/s, when allowed to superimpose. Then the velocity of sound will be

A

320 m/s

B

332 m/s

C

368 m/s

D

312 m/s

Text Solution

Verified by Experts

The correct Answer is:
C
`n_(1) - n_(2) = 8`
`(v)/(lamda_(1)) - (v)/(lamda_(2)) = 8`
`v [(157)/(92) - (155)/(92)] = 8`
`2v = 8 xx 92`
`v = 4 xx 92 = 368 m//s`
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