cse • paper_1 • waves_oscillationscse-2008-subject-02-006
Einstein coefficients — UPSC CSE 2008 Physics PYQ
Buy PYQ Solution Manual →Consider an ensemble of two-level atoms in thermal equilibrium. Show that the ratio of Einstein A and B coefficients is given by \frac{A}{B} = \frac{8\pi h \nu^3}{c^3}. Why is it not possible to achieve inversion of population in a two-level medium ?
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