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Q.

The [[1]]  sound refers to sounds with frequencies greater than 20,000 hertz.

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Detailed Solution

The audible frequency range for the human ear is 20Hz to 20000Hz; waves with frequencies above 20000Hz are called ultrasonic, while waves with frequencies below 20Hz are called infrasonic.

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The [[1]]  sound refers to sounds with frequencies greater than 20,000 hertz.