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CSE · Paper I · Waves & Opticscse-2016-subject-02-007

Einstein transition coefficients — UPSC Physics Optional CSE 2016 Paper I

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Explain the principle of (i) induced absorption, (ii) spontaneous emission and (iii) stimulated emission. Show that the ratio of Einstein's coefficients is given by \frac{A}{B}=\frac{8\pi h\nu^{3}}{c^{3}}

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