The frequency of infrasound is $20 Hz$ or less and ultrasound is ____ $kHz$ or greater.

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Detailed Solution

The frequency of infrasound is

20 Hz

or less and ultrasound is

20 kHz

or greater.
The frequency range of sound waves are used to classify them.
Infrasonic sound is a sound with a frequency of less than

20 Hz

. Ultrasonic sound is sound with a frequency greater than

20 kHz,

whereas audio sound has a frequency between

20 Hz

and

20 kHz .

Ultrasound refers to sound waves with a frequency greater than

20 kHz

(or ultrasonic). Ultrasound can travel freely in solids and liquids, but its intensity decreases in gases. It travels at the same speed as audible sound in a medium.

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