24. What are ultrasonic vibrations? How is it important?
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Ultrasonic vibrations are vibrations in which 20000 hertz or more than sound were take.
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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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