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MIT 8.02 Electricity and Magnetism, Spring 2002 16 Online
OpenStudy (anonymous):

At a rock concert, the sound intensity 1.0 {\rm m} in front of the bank of loudspeakers is 0.10 {\rm W/m^2}. A fan is 30 {\rm m} from the loudspeakers. Her eardrums have a diameter of 8.4 {\rm mm}.

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