Question

The solar constant on the surface of the earth is S. What will be its value on the surface of another planet which is about 5.3 A.U. away from sun

• A. $\frac{S}{5.3}$
• B. $\frac{S}{(5.3)^{2}}$
• C. 5.3 S
• D. (5.3)² S

Answer 1

Answer: (B)

$\frac{S}{(5.3)^{2}}$

Answer 2

Solar constant is the energy crossing per unit area per sec at earth's distance, area being normal to the sun's rays. Also energy falling is inversely proportional to the square of distance from the source.

∴ $S' = \frac{S}{(5.3)^{2}}$