There are some sounds which cannot be heard by human ear. Theses sounds have frequency, either more than 20 kHz or less than 20 Hz The sound whose frequency is less than the 20 Hz is called____.
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There are some sounds which cannot be heard by human ear. Theses sounds have frequency, either more than 20 kHz or less than 20 Hz The sound whose frequency is less than the 20 Hz is called____.

(a.) Ultrasonic sound

(b.) Infrasonic sound

(c.) Plane sound

(d.) Sonic boom
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The the correct option of this question (B) Infrasonic sound.

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