1. Two black plates are floating in space (Tsu = 0 K) and are oriented as shown below. The plates are perfectly insulated such that only their inner surfaces can participate in radiation. Plate A has a temperature of 900 C while plate B has a temperature of 400 C. Find the net radiation exchange between the two plates and the total heat loss through the gap to space. In the drawing below, point A is located directly above the midpoint of plate B. 20 cm A E = 1 EB = 1