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Question

A sound wave of wavelength 4 mm is produced in air, and it travels at a speed of 300 m/s. Will it be audible?

A
Yes
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B
No
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C
Sometimes audible & sometimes inaudible
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D
Can't say
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Solution

The correct option is B No
We know that velocity of sound wave is given by,
v=λf, where λ is wavelength and f is frequency.
f=vλ
f=3004×103
f=75 kHz
We know audible range of human ear is 20 Hz20 kHz.
As frequency of this sound is out of this range, therefore it will not be audible.

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