Which of the following frequency is inaudible to human being?

50Hz

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1KHz

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40KHz

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15KHz

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Solution

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

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