1. The problem statement, all variables and given/known data Standing 20m away from a tower generating 2500W of power how much energy/s hits each of your eardrums? Surface area of eardrum=55mm^2 Assume that the speaker generates sound uniformly in a forward hemisphere. 2. Relevant equations I=P/(4πr^2) r=20m P=2500W 3. The attempt at a solution I=2500/(4π*20^2)=0.497W/m^2 Surface area of eardrum=55mm^2=55*10^-6m^2 0.497W/m^2*(55*10^-6)m^2=2.7*10^-5W The actual answer is 5.5*10^-5W, not sure what went wrong.