1. The problem statement, all variables and given/known data Please refer to the image. Question (a). 2. Relevant equations I= P/(4∏r^2) P=E/t 3. The attempt at a solution After a few attempts, I found the way to get the answer: (6.3 x 10^-6) x (1.5 x 10^-4) x 60 = 5.67 x 10^-8 But I don't understand why the area of the ear canal is used, instead of the area which the energy carried by the wave passes through. From what I understand, intensity depends on the distance from the source, so how come we don't need to take into account the distance of 5.0m?