A sound travelling in air at a speed of $343 m s^{- 1}$ and wavelength $0.1 c m$ is audible to humans.

Longitudinal wave

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Transverse wave

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Solution

The correct option is B
Transverse wave

Given, speed of the sound = $343 m s^{- 1}$ and wavelength = $0.001 m$

We know that, $S p e e d o f s o u n d = F r e q u e n c y \times W a v e l e n g t h$
$\Rightarrow F r e q u e n c y = \frac{S p e e d o f s o u n d}{W a v e l e n g t h} = \frac{343}{0.001} = 343000 H z$
As the frequency of the sound is beyond 20,000 Hz, it is beyond the audible range of humans.
Hence, the sound is inaudible to humans.

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