What power is incident on one square metre of a sphere of radius 1 m?

Answer: Area of sphere = 4p r^{2} = 4p(1)^{2} = 12.6 m^{2} P/A = 10W/12.6 m^{2} = 0.796 W/m^{2} Therefore the power on 1 m^{2} is 0.796 W.

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