Sound waves with a frequency below 20 Hz are called
(a) infrasonic waves
(b) ultrasonic waves
(c) ultrasound
(d) none of these

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Solution

(a) infrasonic waves
Infrasonic waves are sound waves with frequency below 20 Hz.

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Q. Sound waves with a frequency below 20 Hz are called
(a) infrasonic waves
(b) ultrasonic waves
(c) ultrasound
(d) none of these

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Sound waves with a frequency below 20 Hz are called (a) infrasonic waves (b) ultrasonic waves (c) ultrasound (d) none of these

(a) infrasonic wavesInfrasonic waves are sound waves with frequency below 20 Hz.

Sound waves with a frequency below 20 Hz are called
(a) infrasonic waves
(b) ultrasonic waves
(c) ultrasound
(d) none of these

(a) infrasonic waves
Infrasonic waves are sound waves with frequency below 20 Hz.