What is the lower bound of the audible frequency range?

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Multiple Choice

What is the lower bound of the audible frequency range?

Explanation:
Humans can hear frequencies roughly from 20 Hz up to about 20,000 Hz. That makes 20 Hz the lower end of what we perceive as sound. Frequencies well below that, like 2 Hz, fall into infrasound and aren’t heard as tones (they may be felt as vibrations). Frequencies such as 200 Hz and 2,000 Hz are comfortably within the audible range, so they’re not the lower boundary. Therefore, 20 Hz is the correct lower bound of the audible frequency range.

Humans can hear frequencies roughly from 20 Hz up to about 20,000 Hz. That makes 20 Hz the lower end of what we perceive as sound. Frequencies well below that, like 2 Hz, fall into infrasound and aren’t heard as tones (they may be felt as vibrations). Frequencies such as 200 Hz and 2,000 Hz are comfortably within the audible range, so they’re not the lower boundary. Therefore, 20 Hz is the correct lower bound of the audible frequency range.

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