Callen H.B - Thermodynamics And An Introduction To Thermostatistics · Problem 16.5-6

ENTROPY AND DISORDER; GENERALIZED CANONICAL FORMULATIONS

Physics — Statistical Mechanics · two-level-system-entropy-heat-capacity

Problem

A small system has two energy levels, of energies 0 and ε\varepsilon, and of degeneracies g0g_0 and g1g_1. Find the entropy of this system at temperature TT. Calculate the energy and the heat capacity of the system at temperature TT. What is the dominant behavior of the heat capacity at very low and at very high temperature? Sketch the heat capacity. How would this sketch be affected by an increase in the ratio g1/g0g_1/g_0? Explain this effect qualitatively.

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