Why are the ultrasonic rays not audible to us?

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Solution

The frequency range of ultraviolet rays = $a b o v e 20, 000 H z$
The audible range of human ears = $20 H z t o 20, 000 H z$
Hence, the ultrasonic rays have a frequency above the audible range of human ears, which is why the ultrasonic rays are not audible to us

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(d) audible sound waves

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