Question

The value of solar constant is approximately :

• A. $1340watt/m^2$
• B. $430watt/m^2$
• C. $340watt/m^2$
• D. $1388watt/m^2$

Answer 1

The correct option is D $1388watt/m^2$

The solar constant is defined as the amount of heat energy received per second per unit area by a perfect black body placed at the surface of the Earth with its surface being held perpendicular to the direction of the sun's rays.

The value of solar constant is $1388$($\frac{watt}{{meter}^2}$) or $2$($\frac{cal}{cm\times min}$)