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Q.

What are the sound waves of frequency more than 20 kHz called?

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a

Supersonic

b

Audible 

c

Ultrasonic

d

Infrasonic

answer is C.

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Detailed Solution

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  • Humans can hear sounds from frequencies of 20 to 20 kHz.
  • The low-frequency signal that can't be heard by human ears is called an infrasonic signal. Whereas the high-frequency signal that can't be heard by human ears is called ultrasonic sound.
  • Hence, sound waves having a frequency of more than 20 kHz are called ultrasonic sounds. 
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