Question: A 5 5 - dB sound wave strikes an eardrum whose area is 5 . 0 1 0 5 m 2 . The intensity of

A 55-dB sound wave strikes an eardrum whose area is 5.0105m2. The intensity of the reference level required to determine the sound level is 1.01012W/m2.1yr=3.15610^7s.

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