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Q.

Is it true that the frequency of infrasonic sounds is less than 20 Hz and for ultrasonic more, it is 20 kHz is known as infrasonic sound?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
The ultrasonic sound has a frequency of 20 kHz or more while the infrasonic sound has a frequency of 20 Hz or less. Ultrasound is used in many applications and one application is “SONAR”. Which is used in submarines in which the role of sonar is used to find the obstacle undersea and also the depth of the sea.
The correct statement would be, that the frequency less than 20 Hz is known as infrasonic, and a frequency more than 20 kHz is known as ultrasonic.
 
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