cse • paper_1 • thermal_physics
[UPSC CSE 1990] Statistical Physics (Q321, 20M)
A system is composed of two-level atoms, the excited state 1, being 0.10\text{ eV} above the ground state 0. Find the fraction of all atoms which will be in state 1 if the system is in thermal equilibrium at temperature 300\text{ K}.
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