Question

what is mean by rarefaction?

Answer 1

Answer:

rarefaction. ... When rarefaction occurs, the particles in a gas become more spread out. You may come across this word in the context of sound waves. A sound wave moving through air is made up of alternating areas of higher and lower density. The areas of lower density are called rarefactions.

Answer 2

Answer:

it is a part of a longitudinal wave of sound.

longitudinal wave have two parts

i) compression and

ii) rarefaction

I think you have got your answer.