what is infrasonic's ? (in sound)
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INFRASONIC. Pertaining to VIBRATIONs and SOUND WAVEs whose FREQUENCY is too low to be heard as sound by the human ear, i.e. below about 20 Hz. The term is also used loosely to describe any low frequency sound. Compare: AUDIO, BASS, PULSE, RUMBLE, SONICS, SUBSONIC, ULTRASONIC.
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the sound below the frequency of 20 Hz which is not audible by humans is called infrasonic sound..
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