Two sound waves of wavelength $92 / 157 m$ and $92 / 155 m$ produce $8 b e a t s / s$ , when allowed to superimopse. The velocity of sound is

320 m / s

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332 m / s

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368 m / s

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312 m / s

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Solution

The correct option is C $368 m / s$
Fomula,

$v (\frac{1}{λ_{2}} - \frac{1}{λ_{1}}) = 8$

$v (\frac{155}{92} - \frac{157}{92}) = 8$

$v = \frac{8 \times 92}{2} = 368 m / s$

the velocity of sound is $368 m / s$

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