What are infrasonic and ultrasonic sounds ?

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Solution

A sound which has a frequency less than $20$ per second is called infrasonic sound.
A sound which has frequency more than $20000$ per second is called ultrasonic sound.

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What are infrasonic and ultrasonic sounds ?

A sound which has a frequency less than 20 per second is called infrasonic sound.A sound which has frequency more than 20000 per second is called ultrasonic sound.

A sound which has a frequency less than $20$ per second is called infrasonic sound.
A sound which has frequency more than $20000$ per second is called ultrasonic sound.