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Question #1816

General Knowledge

Ultrasonic waves are those sound waves having frequency __________?

Options:

A) between 20 hertz and 1000 hertz

B) between 1000 hertz and 20000 hertz

C) less than 20 hertz

D) more than 20 kilohertz

Answer: Ultrasonic waves are those sound waves having frequency more than 20 kilohertz.

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