Sound is travelling in air at a speed of 343 m/s. The wavelength of the sound wave is 0.1 cm. Humans can easily perceive this sound.

True

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False

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Solution

The correct option is B False
Speed of the sound = 343 m/s
Speed = Frequency x Wavelength
Wavelength = 0.001 m
Thus, Frequency = $\frac{S p e e d}{W a v e l e n g t h}$ = 343000 Hz.
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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Sound is travelling in air at a speed of 343 m/s. The wavelength of the sound wave is 0.1 cm. Humans can easily perceive this sound.

The correct option is B FalseSpeed of the sound = 343 m/s Speed = Frequency x Wavelength Wavelength = 0.001 m Thus, Frequency = SpeedWavelength = 343000 Hz. 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.