Two systems in thermal contact now consider two systems of bosons, si and s2, in which each boson can independently take any of the energy levels given by eq. (2). first suppose that s1 and s2 are each isolated. in s1 there are two bosons which can be distinguished by their colour, red (r) and green (g), and s2 has two bosons, blue (b) and white (w). the internal energy of s1 is u1 )-5 and that of s2 is u2-u20)-1. the total energy of the combined system s is (a) find the number of accessible states g(u) and the entropy σ(u) of the combined system (b) now bring the two systems in thermal contact, while the combined system as a whole is isolated. identify all possible configurations, i. e., all values of u1. for each configuration (each value of u1), find the number of accessible states in each system, gi (ui) and 92(u2). what are the number of accessible states g(u) and the entropy σ(u) of the combined system (c) plot the probability distribution p(ui) as a function of u1 (e. g., make a histogram): g(u) what is the most probable configuration in thermal equilibrium? also calculate the average value of u1.