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Q.

Ultrasonic, sonic and infrasonic are in the order of [[1]] frequency.


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Detailed Solution

Ultrasonic, sonic and infrasonic are in the order of decreasing frequency.
The human range of hearing is from 20 Hz to 20 kHz frequency. Sounds of frequency less than 20 Hz are defined as infrasound, while the sound of frequency more than 20 kHz is termed ultrasound. The order given in the statement is decreasing order of frequency.
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