HW 8 Prob. 3 The surface temperature of the sun is To. The sun's radius is R (=7x108m) while the earth's radius is r (-6.37x10m). The mean distance between the sun and the earth is L (=1.5x10"Im). The earth has reached a steady state of absorbing and emitting radiation so that its temperature remains constant. (a) Without using the Stefan-Boltzmann constant, find an approximate expression for the temperature T of the earth in terms of the parameters given above. (b) Calculate the temperature of the sun given T=290K. E msi G