Consider the leaf of Problem 70. Assume that the top surface of the leaf absorbs 70.0% of 9.00 × 102 W/m2 of radiant energy, while the bottom surface absorbs all of the radiant energy incident on it due to its surroundings at 25.0°C.
(a) If the only method of heat loss for the leaf were thermal radiation, what would be the temperature of the leaf? (Assume that the leaf radiates like a blackbody.)
(b) If the leaf is to remain at a temperature of 25.0°C, how much power per unit area must be lost by other methods such as transpiration (evaporative heat loss)?