The human eardrum has an area of 5.0×10-5 m2.
(a) What is the sound power received when the incident intensity is the minimum perceivable, 1.0×10-12 W/m2?
(b) What is the sound power at the eardrum for conversational speech, which has a sound level of 65 dB?
(c) What is the sound power at the threshold of pain, 140 dB?