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Sound waves having frequencies less than $20 Hz$ and greater than zero is called [[1]](infrasonic/ultrasonic) sound.

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Detailed Solution

Sound waves having frequencies less than

20 Hz

and greater than zero are called infrasonic sound, and sound waves having frequencies more than

20000 Hz

are called ultrasound. Infrasonic sound is produced by elephants and by natural events such as volcanic eruptions, earthquakes, and sea waves.

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