(0) LupelatuUDIST 100 The solar constant is the amount of heat energy received per second per unit area of a perfectly black surface placed at a mean distance of the Earth from the Sun, in the absence of Earth's atmosphere, the surface being held perpendicular to the direction of Sun's rays. Its value is 1388 W/m2 If the solar constant for the earth is 's'. The surface temperature of the sun is TK, D is the diameter of the Sun, R is the mean distance of the Earth from the Sun. The sun subtends a small angle 'e' at the earth. Then correct options is/are :- (1) s= ct* ® (2) s= *) (3) s= * 02 (4)s=