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How much sound energy is incident on the eardrum during this time?

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A person is exposed to a sound intensity level of 90.0 dB for a period of 9 hours. An eardrum has an area of 2.17x10^-4 m^2. How much sound energy is incident on the eardrum during this time?

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  1. 90 dB = 1E-3 w/m^2 intensity

    Energy in J = area * intensity * time = 2.17E-4 * 1E-3 * 9 * 3600.

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