1.

The correct expression for the rate of stimulated emission is _______________

A. R<sub>se</sub> = A<sub>21</sub>N<sub>2</sub>
B. R<sub>se</sub> = A<sub>21</sub>uN<sub>2</sub>
C. R<sub>se</sub> = B<sub>21</sub>N<sub>2</sub>
D. R<sub>se</sub> = B<sub>21</sub>uN<sub>2</sub>
Answer» E.


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