Question

We have learned that vibration is necessary for producing sound. Explain why the sound produced by every vibrating body cannot be heared by us.

Answer 1

I think the our hears can hear only the sounds having frequency from 20Hz to 20000Hz..............so our hears are not able to hear the sound with less than frequency of 20Hz i.e. infrasound as well we cannot hear the sound having frequency higher than 20000Hz i.e. ultrasound......

hope so it helps