A system has four non-degenerate energy levels. The energy levels are E1 = 0, E2 = 1.4 x 10-23 J, E3 = 4.2 x 10-23 J, E, 8.4 x 10-23 J. Given that the system is at a temperature of 5K, what is the probability that the system is in the E =0 level? A system has two non-degenerate energy levels with an energy gap of 0.leV = 1.6 x 10-20 J. What is the probability of the system being in the upper level if it is in thermal contact with a heat bath at a tenmperature of 300 K? At what temperature would the probability be 0.25? %3D