Which of the following frequencies is inaudible to human being?

50 Hz

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1 kHz

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40 kHz

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15 kHz

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Solution

The correct option is C 40 kHz
The audible range of a human ear is 20 Hz to 20 kHz. Frequencies above 20 kHz and below 20 Hz are inaudible to human beings which are known as ultrasonic sound and infrasonic sound respectively.
Hence, 40 kHz frequency will be inaudible to human ears.

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