 Solution

ID: past-exam-of-the-physics-b-course-of-the-university-of-cambridge/2014/paper-2/section-c/c11/c/solution

Substitute the entropy differential into the given first law:

d U = T (\frac{C _{A}}{T} d T - γ^{'} d A) + γ d A, d U = C_{A} d T + (γ - T γ^{'}) d A .

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