GK
GENERAL SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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When the sound of frequency below 20 Hertz, we call the sound ____
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Supersonic
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Infrasonic
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Ultrasonic
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Audio sounds
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Explanation:
Detailed explanation-1: -Sounds having frequencies lower than 20 Hz are below audible level and hence are called infrasonic sound.
Detailed explanation-2: -The sound waves, having frequencies below 20 Hz are called infrasonic sounds. Human beings can not hear an infrasonic sound. Animals like elephants produce rumbling sounds of low frequency ( 14 Hz ) .
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