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Q.

Those waves which have a frequency more than $20 kHz$ are ____ waves.

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Detailed Solution

Those waves have a frequency more than

20 kHz

are ultrasonic waves.
Basically, frequency is the number of occurrences of a continuous event per unit time, or it may be referred to as the number of waves or vibrations in a unit time by a body in periodic motion. The frequency of a wave is measured in its S.I unit Hertz or

Hz

and is represented by the symbol.
And the sound of a frequency of more than

20 kHz

is called ultrasonic. These sounds of higher frequency are inaudible to humans, and sound waves of frequency below

20 Hz

are called infrasound.

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Those waves which have a frequency more than 20 kHz are ____ waves.