Q. The sun delivers $10^{4}\ Wm^{- 2}$ of electromagnetic flux to the earth’s surface. The total power that in incident on a roof of dimensions 10m square will be
A) $10^{4}$W
B) $10^{5}$ W
C) $10^{6}$ W
D) $10^{7}$ W
Explanation
(c) Total power=solar constant $\times$ area
$= 10^{4} \times (10 \times 10) = 10^{6}\ W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.