Question

The sound of frequency less than 20 Hz is called :
(a) supersonic
(b) infrasonic
(c) ultrasonic
(d) ultrasound

Propagation of Sound Waves Class 9 ICSE

March 28, 2024

Answer

(b) infrasonic

Reason — The sound of frequency in the range 20 Hz to 20 kHz is called the sonic or audible sound; the sound of frequency less than 20 Hz is called infrasonic and greater than 20 kHz is called ultrasonic.

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Question

The sound of frequency less than 20 Hz is called :(a) supersonic(b) infrasonic(c) ultrasonic(d) ultrasound

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The sound of frequency less than 20 Hz is called :
(a) supersonic
(b) infrasonic
(c) ultrasonic
(d) ultrasound