Question

what is ultrasonic sound​

Answer 1

Answer:

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.

Answer 2

Answer:

The sound which have a frequency more than 20,000 Hz and not audible to human's ear are known as ultrasonic sounds ....

Explanation:

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