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of, concerned with, or producing waves with the same nature as sound waves but frequencies above audio frequencies
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Pertaining to signals, equipment, or phenomena involving frequencies just above the range of human hearing, hence above about 20,000 hertz. Also known as supersonic (deprecated usage).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
ultrasonicUltrasonic refers to sound that is beyond the audible hearing range; typically above 20 kHz (20,000 Hz). In medicine, ultrasound machines emit ultrasonic waves that echo back an image of a fetus or internal organ. They are also used to administer therapy to various parts of the body. Contrast with infrasonic. See ultrasonic welding and saser.
|Kardia Ultrasonic EKG Data Transfer|
|By placing fingers on this pad for 30 seconds, the body's electrical heart rhythm is converted to ultrasonic waves picked up by the Kardia app running in a smartphone nearby. The finger pad has no battery.|
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