Question

A given sound is inaudible to the human ear. We can then say that this is so -​

Answer 1

Answer:

Only because it's frequency is above 20Hz.

Answer 2

Answer:

Sound frequency below 20 Hz [ infrasonic sounds ] can't be easily detected by the human ears.

Explanation:

Normally a sound can be heard when it has range between 20 Hz to 20,000 Hz. So any sound below 20Hz [infrasonic sound] can't be audible and sounds above 20,000 Hz [ ultrasonic sound] human ear cannot detect frequencies which is above 80 decibels of safe limit.