Question

what is the rarefaction of a longitudinal wave?
the place where the particles are farthest apart
how fast the parts of the wave move
the resting position of the wave
the place where the particles are closest together

Explanation:

In a longitudinal wave, rarefaction is defined as the region where particles are spread apart (farthest apart). The second option refers to wave speed, the third to equilibrium position (not rarefaction), and the fourth is compression (opposite of rarefaction).

Answer:

the place where the particles are farthest apart