Find the frequency of a sound wave travelling in air with a wavelength of $0.85 m$ .
The velocity of sound in air is $340 m s^{- 1}$

400 H z

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360 H z

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420 H z

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380 H z

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Solution

The correct option is A $400 H z$
Given:
Wavelength, $λ = 0.85 m$
Speed of sound, $v = 340 m / s$

Let the frequency be $f$
Speed of sound is given by:
$v = f λ$
$340 m / s = 0.85 m \times f$
$f = 400 H z$

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