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Q.

Choose the correct option to complete the given statement.

Sound of frequency ranging above 20,000 Hz is known as :

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a

Ultrasonic 

b

Infrared

c

Supersonic

d

Audible

answer is D.

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Detailed Solution

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Ultrasonic sounds are sounds that have a frequency of more than 20,000Hz. These sounds are inaudible to human ears as humans can hear sound in the frequency range of 20Hz to 20 kHz. Ultrasonic sounds are used by bats, whales, and dolphins for navigation. 

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