Sound is detected when a sound wave causes the eardrum to vibrate. Typically, the diameter of the eardrum is about \(8.4 \mathrm{~mm}\) in humans. When someone speaks to you in a normal tone of voice, the sound intensity at your ear is approximately \(1.0 \times 10^{-6} \mathrm{~W} / \mathrm{m}^{2}\). How much energy is delivered to your eardrum each second?