Question

As longitudinal wave travel particles in the medium are pushed together and then pulled apart. we call this

Answer 1

compression

Step-by-step explanation:

The part of a longitudinal wave where the particles are more closely pushed together is called a compression.

Answer 2

compression and rarefaction

Step-by-step explanation:

This kind of wave is called a longitudinal wave and an example of such a wave is a sound wave. The center of compression can be analogous to the top of a crest of a transverse wave while the center of the rarefaction would be analogous to the bottom of the trough of a transverse wave.