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cse • paper_1 • thermal_physicscse-1990-subject-04-007

Thermal equilibrium — UPSC CSE 1990 Physics PYQ

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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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