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2016-03-01T11:13:10+05:30

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Sounds of frequencies below 20 Hz are called infrasonic sound or infrasound. Frequencies higher than 20 kHz are called ultrasonic sound or ultra sound.
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2016-03-01T11:21:26+05:30

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1- Frequencies below 20 Hz => infrasonic sound
    
2- Frequencies higher than 20 kHz => ultrasonic sound
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