Sound of frequency above $20 k H z$ is called as

ultrasound

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infrasound

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breakable

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unbreakable

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Solution

The correct option is A ultrasound
Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range.
Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.
Hence, the ultrasonic waves are high frequency waves beyond human audibility.

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