Question

The value of the solar constant is approximately equal to?

Answer 1

1. Solar constant is the amount of radiation incident by the sun perpendicularly per unit time per unit surface area of the earth.
2. The average value of the solar constant is $1.366\raisebox{1ex}{$KW$}\!\left/ \!\raisebox{-1ex}{$m^2$}\right.$
3. It is almost a constant quantity varying only about 0.2 % at its maximum.