The sun delivers 103W/m2 of electromagnetic flux to the earth’s surface. The total power that is incident on a roof of dimensions 8m×20m is 1.6×105W, then the radiation force on the roof will be
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a
1.33×10−3N
b
2.3×10−3N
c
8.53×10−5N
d
5.33×10−4N
answer is D.
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Detailed Solution
The radiation force,F=Radiation Pressure ×Area =PA = IcA ⇒F=103×8×203×108=5.33×10−4N