define ultrasonic waves.
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Ultrasound refers to a sound wave with a frequency greater than the upper limit of human hearing, which is generally over 20 kHz.
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Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz in healthy young adults
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