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What is the relationship between B21 and B12?

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What is the relationship between B21 and B12?

(a) B12 > B21

(b) B12 < B21

(c) B12 = B21

(d) No specific relation
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The correct answer is (c) B12 = B21

Explanation: B21 is the coefficient for the stimulated emission while B12 is the coefficient for stimulated absorption. Both the processes are mutually reverse processes and their probabilities are equal. Therefore, B12 = B21.
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