1. The problem statement, all variables and given/known data What is the displacement amplitude of a sound wave of frequency 160.0 Hz in air at 20 °C at the pain-threshold pressure amplitude of 29.0 Pa? f = 160 Hz Vs = 343 m/s ΔP = 29 Pa 2. Relevant equations ΔP(x,t) = (ΔP)cos(kx - wt) = β*s*k*cos(kx - wt) k = f/Vs 3. The attempt at a solution ΔP = βsk Therefore, s = ΔP/(β*k) = (ΔP*Vs)/(f*β) β = 1.4 * 10^5 Pa So the answer I got was 4.44*10^-4 m which is wrong. Am I missing something here?