Question

Difference between audible and inaudible

Answer 1

the sound wave with frequency btw 20 Hz-20000Hz is audible
and sound wave with frequency less than 20 Hz or more than 20000 Hz is inaudible

Answer 2

Audible sound means the sound which we can hear which lies between frequency 20 Hz to 20KHz.
Inaudible sound means the sound which we cannot hear choose frequency is either less than 20Hz or more than 20KHz.
I hope it helps you.