Amount of heat energy radiated by unit surface of the sun in the same time workout asTake, R = mean distance of earth from the sun and r = radius of sun

• A. E = π R2 S/4 π R2
• B. E = 4 π R2 S/4 π R2
• C. E = 4 π R2
• D. E = 4 π R2 S