Question

the sound below certain frequencies can,t be heard by us​

Answer 1

Answer:

A wind turbine, a roaring crowd at a football game, a jet engine running full throttle: Each of these things produces sound waves that are well below the frequencies humans can hear. But just because you can’t hear the low-frequency components of these sounds doesn’t mean they have no effect on your ears. Listening to just 90 seconds of low-frequency sound can change the way your inner ear works for minutes after the noise ends, a new study shows.

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Explanation:

Answer 2

Answer:

Yes exactly sound below frequency 20 HZ can't be heard.

Explanation:

HZ: Unit of frequency.