Consider the following statements about sound passing through a gas.

When we clap our hands, the sound produced is best described by
(Here p denotes the change in pressure from the equilibrium value)

1. p = p₀ sin(kx – ωt)

2. p = p₀ sin kx cos ωt

3. p = p₀ cos kx sin ωt

4. p = \(\sum\)p_0n sin(k_nx – ω_nt)