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Consider a system in thermal and diffusive contact with a reservoir. Treat the reservoir as ideal...

Consider a system in thermal and diffusive contact with a reservoir. Treat the reservoir as ideal gas of particles at temperature τ . The system can be in either of the following three states: unoccupied with energy zero, occupied with energy zero (ground state), and occupied with energy ∆ (excited state). (a) Calculate the thermal average occupancy of the ground and excited sates. (b) Find the gas pressure at which the average occupancy of the system is 1/2. (c) Calculate the thermal average energy of the system.

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