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

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The radius of a typical human eardrum is about 4.0 mm. Find the energy per second received by the eardrum when it listens to sound that is (a) at the threshold of hearing and (b) at the threshold of pain. (The intensities for the threshold of hearing and pain are: 10^-12 W/m^2 and 1 W/m^2).

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