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Characteristics of Sound Waves

Sounds of fre...

Question

Sounds of frequency less than 20 Hz are called

A

supersonic sounds

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B

ultrasonic sounds

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C

sonic sounds

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D

infrasonic sounds

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Solution

The correct option is D
infrasonic sounds

Sounds of frequency less than 20 Hz are called Infrasonic sounds.
Sounds of frequency more than 20,000 Hz are called ultrasonic sounds.
Hence, option (d) infrasonic sound has a frequency of less than 20 Hz.

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