The radius of a typical human eardrum is about 40 mm find

Question

Solve the following question:

Question: The radius of a typical human eardrum is about 4.0 mm.

Part A: Find the energy per second received by an eardrum when it listens to sound that is

1- At the threshold of hearing and

2- At the threshold of pain.

I need tutor help to solve the above question and the intensities for the threshold of hearing and pain are: 10-12 W/m² and 1 W/m²).