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Which of the following Einstein’s coefficient represents spontaneous emission?

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Which of the following Einstein’s coefficient represents spontaneous emission?

(a) A12

(b) A21

(c) B12

(d) B21

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I want to ask this question from Einstein Coefficients topic in portion Laser of Engineering Physics II

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Best answer
Correct option is (b) A21

Best explanation: A21 represents the spontaneous emission of photons. A12 signifies spontaneous absorption.B12 is for stimulated absorption while B21 is for stimulated emission.

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