The frequency of ultrasound waves is

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less than 20 Hz

between 20 Hz and 2 kHz

between 2 kHz and 20 kHz

greater than 20 kHz

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This question was previously asked in

UPSC NDA-2 – 2018

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The frequency of ultrasound waves is greater than 20 kHz.

– The audible range of sound frequencies for humans is typically considered to be from 20 Hz to 20,000 Hz (20 kHz).
– Sound waves with frequencies below 20 Hz are called infrasound.
– Sound waves with frequencies above 20 kHz are called ultrasound.

Ultrasound has various applications in medicine (imaging, therapy), industry (cleaning, welding), and technology (sonar, pest control). The exact upper limit of human hearing varies with age and individual.

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