Question

The sun delivers $10^{3} \,W / m ^{2}$ of electromagnetic flux to the earth's surface. the radiation force on the roof will be

• A. $8.53 \times 10^{-5} N$
• B. $2.3 \times 10^{-3} N$
• C. $1.33 \times 10^{-3} N$
• D. $5.33 \times 10^{-4} N$

Answer 1

Answer: (D)

Force of radiation $=\frac{\text { Power }}{c}$
$=\frac{1.6 \times 10^{5}}{3 \times 10^{8}}$
$=5.32 \times 10^{-4} \,N$