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A microphone is 9.3 m from a point source of sound. The microphone detects an intensity...

A microphone is 9.3 m from a point source of sound. The microphone detects an intensity of 121.8 pW/m2. (Recall the pico prefix means LaTeX: 10^{-12} 10 − 12 .) Assuming the generator is perfectly efficient, what power in pW is required to produce the detected sound? Report your answer to the nearest pW.

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1:上 2. m 2 P 132 38 D PW

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