What is ultrasound?please urgently need answer
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The sound beyond 20000 hertz is called ultrasound. It cannot be herd by human ear.
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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 in 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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