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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. | |