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Question

Sounds having frequency more than 20,000 Hz are called -

A
sonic sound
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B
ultrasonic sound
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C
infrasonic sound
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D
none of these
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Solution

The correct option is B ultrasonic sound
Sounds having frequency more than 20,000 Hz are called Ultrasonic sound. As this is above the normal hearing range for humans, we cannot hear ultrasonic sound.

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