A 73kw radio station broadcasts its signal uniformly in all, Physics

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A 73kw radio station broadcasts its signal uniformly in all

A 73kW radio station broadcasts its signal uniformly in all directions.
Part A:What is the average intensity of its signal at a distance of 300m from the antenna? I_avg=_______mW/m^2
Part B:What is the average intensity of its signal at a distance of 3000m from the antenna?
I_avg=______mW/m^2

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