When a sound frequency exceeds 20kHz it is said to be -

Audible to human beings

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Infrasonic Sound

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Ultrasonic Sound

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Supersonic Sound

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Solution

The correct option is C Ultrasonic Sound
Sound waves can be classified in the following ways according to frequency.
Audible range: 20Hz to 20kHz
Infrasonic Sound: having frequency less than 20Hz
Ultrasonic Sound: Having frequency greater than 20kHz Supersonic Sound: When the speed of the source of sound is greater than speed of sound then it produces supersonic sound.

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