what is ultrasonic and infrasonnic sound
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Sound waves can be used to determine the distances and structure of some objects or tissues. Infrasound is sound that is below the lower limit of human hearing, below 20 Hz, and ultrasound is above the upper limit of human hearing, above 20,000 Hz.
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Ultrasonic sounds are the sound rays of 50 hertz to 50000 hertz.
Infrasonic sounds are the sound rays of 10 hertz to 100 hertz.
Both the sounds are not audible to human beings
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