2. The rate at which radiant energy reaches the surface of the earth from the sun is 1.40 kW/m^2. The distance from the earth to the sun is 1.49 x 10^11 m, and the radius of the sun is 6.95 x 10^8 m. a. What is the rate of radiation of energy per unit area from the sun's surface? b. If the sun radiates as an ideal blackbody, what is the temperature of its surface? , I know I don't have any actual WORK for this problem, but that's because I have absolutely NO CLUE where to start. I have the equation for the rate at which radiant energy reaches the surface, but I've already been given a value for that. If anyone who is good at this kind of thermodynamics, any help is appreciated. Thanks.