Which arrangement correctly classifies 16 kHz and 20 kHz frequencies?

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Multiple Choice

Which arrangement correctly classifies 16 kHz and 20 kHz frequencies?

Explanation:
Frequencies up to about 20 kHz are audible to humans, while ultrasound is defined as frequencies above that threshold. So 16 kHz lies within the audible range and would be heard, whereas 20 kHz sits at the upper limit and is treated here as ultrasound. That’s why the correct arrangement is: 16 kHz is audible; 20 kHz is ultrasound.

Frequencies up to about 20 kHz are audible to humans, while ultrasound is defined as frequencies above that threshold. So 16 kHz lies within the audible range and would be heard, whereas 20 kHz sits at the upper limit and is treated here as ultrasound. That’s why the correct arrangement is: 16 kHz is audible; 20 kHz is ultrasound.

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