At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation -

Options

A. `22 1/2^@` North and South
B. `40^@` North and South
C. `42 1/2^@` North and South
D. `66^@` North and South

Answer

B

Explanation

The solar insolation is the actual amount of solar radiation incident upon a unit horizontal surface over a specified time. At `40^@` North and South the heat gain through insolation approximately equal to the heat loss through terrestrial radiation.