The energy flux associated with solar radiation incident on the outer surface of the earth’s atmosphere has been accurately measured and is known to be 1368 W/m2. The diameter of the sun and earth are 1.39 X 109 and 1.27 X 107 m, respectively, and the distance between the sun and the earth is 1.5 X 1011 m.(a) What is the emissive radiation flux of the sun surface?(b) Approximating the sun’s surface as a black body ( = 1), what is its temperature?(c) At what wavelength is the spectral emissive power of the sun a maximum?(d) Assuming the earth’s surface to be a black body ( = 1) and the sun to be the only source of energy for the earth, estimate the earth’s surface temperature.