By Measurement You Determine Sound Waves Are Spreading Out

By measurement you determine that sound waves are spreading out equally in all directions from a point source and that the intensity is 0.026 W 1m2 at a distance of 4.3 m from the source.
(a) What is the intensity at a distance of 3.1 m from the source?
(b) How much sound energy does the source emit in one hour if its power output remains constant?

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