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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1.33×10−3N

2.3×10−3N

8.53×10−5N

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

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