Which statements correctly describe compression and rarefaction in a small-amplitude sound wave?
Select all that apply

Question

Which statements correctly describe compression and rarefaction in a small-amplitude sound wave?

G1 Physics · Accepted Answer

In a compression, particles are crowded, so density and pressure are both above equilibrium. Thus, Δρ > 0 and Δp > 0. In a rarefaction, both are below equilibrium. Since Δp = v²Δρ, pressure and density variations are in phase. Therefore all four statements are correct.