Ultrasonic

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Ultrasonic

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In acoustics, of or pertaining to frequencies above those that affect the human ear, i.e., more than 20,000 vibrations per second. </dd>
The term ultrasonic may be used as a modifier to indicate a device or system intended to operate at an ultrasonic frequency, as an ultrasonic vibrator. Supersonic was formerly used in acoustics synonymously with ultrasonic; this usage is now rare. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use