Two closed systems (of same dimensions) A and B comprise each NA and NB harmonic oscillators, respectively. Initially, the temperature of system A is bigger than the temperature of system B. The two systems are then brought into contact through one of their walls, which is diathermic, to form a composed system (also closed). a) Find the multiplicity function for the composed system as a function of energy and number of harmonic oscillators. b) Find the Entropy for the composed system (Entro