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P N
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I=P/4pi*r^2
Part D
The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10^{-12}\;\rm W/m^2. Find the distance d from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 {\rm W} of sound, as suggested in the last follow-up comment.
Express your answer numerically in meters.
I got 21850m as the answer, but it's wrong ...
Part D
The threshold of hearing is defined as the minimum discernible intensity of the sound. It is approximately 10^{-12}\;\rm W/m^2. Find the distance d from the car at which the sound from the stereo can still be discerned. Assume that the windows are rolled down and that each speaker actually produces 0.06 {\rm W} of sound, as suggested in the last follow-up comment.
Express your answer numerically in meters.
I got 21850m as the answer, but it's wrong ...