Th sun delivers 103W/m2 of electromagnetic flux to the earths surface. The total power that is incident on a roof of dimensions 8m×20m,then the radiation force on the roof will be
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a
8.53×10-5N
b
2.3×10-3N
c
1.33×10-3N
d
5.33×10-4N
answer is D.
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Detailed Solution
Force of radiation =Powerc=8×20×1033×108=5.32×10-4N