Question

explain meaning of the terms compression and rarefaction in relation to a longitudinal wave

Answer 1

Compression and rarefaction (ESACT) However instead of crests and troughs,longitudinal waves have compressions and rarefactions. A compression is a region in alongitudinal wave where the particles are closest together. Ararefaction is a region in alongitudinal wave where the particles are furthest apart

Answer 2

compression: It is region where the particles are closer to each other.

Rarefaction: It is a region in a longitudinal wave where the particles are furthest apart.