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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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.

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.