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Question

The sound waves with a frequency greater than 20 KHz are known as:


A

Ultrasound

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B

Infrasound

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C

Supersound

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D

Megasound

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Solution

The correct option is A

Ultrasound


The sound waves with a frequency greater than 20 KHz are known as ultrasound (or ultrasonic). Ultrasound can travel freely in solids and liquids, but in gases, its intensity falls. In a medium, it travels with the same speed with which the audible sound travels.


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