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Question

Which of the following frequency of sound can't be heard by human beings?

A
40 Hz
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B
400 Hz
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C
4000 Hz
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D
40,000 Hz
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Solution

The correct option is B 40,000 Hz
Human ear can hear sound having frequency range from 20 Hz to 20 kHz.
Thus sound of frequency 40,000 Hz can't be heard by human beings.

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