posted by Anonymous .
Suppose a sound of frequency 1200 Hz is emitted from a speaker 15 meters away from you. At YOUR location, the intensity is 1.0E-7 W/m2. Let me assume your eardrum has area 3E-5 m2. If the sound continues for 8 seconds, what total amount of energy is received by your ear?
You have more information than you need to answer the question.
Multiply 10^-7 W/m^2 by the eardrum area and 8 seconds. That will be the received energy in Joules.