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A system has two non-degenerate energy levels with an energy gap of 0.1eV=1.6×10-20 J.
(i) Write down the partition function for these two-level system
(ii) What is the probability of the system being in the excited state (upper level) if it is in thermal contact with a heat bath at a temperature of 300K?
(iii). Suggest two applications of two-level systems in physics where this model be useful?
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