The sun delivers103 Wm–2 of electromagnetic flux to the earth’s surface. The total power that is incident on a roof of dimension 8m x 20m will be

1) 6.4 x 103 W

2) 3.4 x 104 W

3) 1.6 x 105 W

4) none of these

Answer: 3) 1.6 x 105 W

Solution:

Power per unit area, I = 103 Wm–2

Total power = I x area of the roof 

= 10x 8 x 20 

= 1.6 x 105 W

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