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| Q. |
Which Einstein’s coefficient should be used in this case? |
| A. | a12 |
| B. | a21 |
| C. | b12 |
| D. | b21 |
| Answer» D. b21 | |
| Explanation: the given figure shows stimulated emission. hence, the einstein coefficient for stimulated emission is b21. if it had been spontaneous emission, then a21 would have been used. | |
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