1. If the same source as in question 1 (i.e., 10 W) is placed at the centre of a sphere 10.0 m in radius. If the source is turned on for 3.00 s, how much energy is incident on the square in (c) ?

Answer:
From part (c) , Power on square = 7.96X10-5 W
Energy = Power X time = 7.96X10-5 X 3.00 = 2.39X10-4 j

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