define ultrasonic vibration
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Ultrasonics, vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 kilohertz. ... Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies greater than 1013 hertz
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Ultrasonics, vibrations of frequencies greater than the upper limit of the audible range for humans—that is, greater than about 20 kilohertz. ... Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies greater than 1013 hertz
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