The sun delivers 10^(3)W//m^(2) of elect...

The sun delivers `10^(3)W//m^(2)` of electromagnetic flux to the earth's surface. The total power that is incident on a roof of dimensions `8mxx20m` is `1.6xx10^(5)W`, the radiation force on the roof will be-

`6.4 xx 10^(-3)W`

`3.4 xx 10^(4)W`

`1.6xx10^(5)W`

none of these

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The correct Answer is:

`P=IA=10^(3)xx8xx20=1.6 xx 10^(5)W`

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