1W = 1J/s
Where, P is the power an A is an area.
The sound intensity at 53.0 m from the speaker:
A concert loudspeaker suspended high off the ground emits 31.0 W of sound power. A small microphone with a 0.800 cm2 area is 53.0 m from the speaker.
How much sound energy impinges on the microphone each second?
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