 Solution

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

Since

γ^{'} = d γ / d T < 0

(\partial S / \partial A)_{T} = - γ^{'} > 0

. Thus isothermal stretching increases the film's entropy.

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