what do u mean by ultrasonic waves?
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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. The term sonic is applied to ultrasound waves of very high amplitudes.
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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. The term sonic is applied to ultrasound waves of very high amplitudes.
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