What us ultrasonic and infrasonic sound waves
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Ultrasonic sound waves have frequencies above 20000 hz and infrasonic sound waves have frequencies below 20 hz.
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Ultrasonic waves are acoustic waves that are so high in frequency that humans can’t hear them; however, infrasonic waves are sound waves that are lower in frequency than what humans can hear. A subsonic wave is a wave that is traveling slower than the speed of sound and a supersonic waves travels faster.
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