A 55-dB sound wave strikes an eardrum whose area is 5.0×10^−5m2. The intensity of the reference level required to determine the sound level is 1.0×10^−12W/m2. 1yr=3.156×10^7s.
How much energy is absorbed by the eardrum per second?
At this rate, how long would it take the eardrum to receive a total energy of 1.0 J?