If we consider solar system consisting of the earth and sun only as one of the ideal thermodynamic system. The sun works as source of energy having temperature 6000 K and the earth as sink having temperature 300K, the efficiency of solar system would be on the basis of exchange of radiations

Options

A. 0.3
B. 0.65
C. 0.75
D. 0.95

Answer

D

Explanation

`eta=1-(T_2)/(T_1)=1-(300)/(6000) implies eta=0.95=95%`