A particular person's eardrum is circular, with a diameter of 8.50 mm. (a) How much sound energy (in ) is delivered to an eardrum in one second, at the threshold of human hearing? (The threshold of human hearing is taken to be 1.00 X 10-12 W/m2.) (b) How much sound energy (in )) is delivered to an eardrum in one second, at the pain threshold for human hearing? (The pain threshold occurs at 1.00 W/m , one trillion times as intense as the lowest audible level.) (c) Assume that musicians onstage are exposed to sound that is 10 decibels below the human pain threshold. Over the course of a two-hour concert, how much sound energy (in )) does each ear absorb onstage?(d) Assume that the amplifiers on the stage operate at a combined power of 5,000 Watts, and that 80% of this is converted to sound.