Question

1. What is sound?...​

Answer 1

$\:\:\:\huge\color{pink}\boxed{\colorbox{black}{Answer:}}$

Sound is a form of energy which gives the sensation of hearing.

Answer 2

Explanation:

In physics, sound is a vibration that propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. ... Sound waves below 20 Hz are known as infrasound.