MCQOPTIONS
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MCQOPTIONS
| 1. |
Which of the following Einstein s coefficient represents spontaneous emission? |
| A. | A<sub>12</sub> |
| B. | A<sub>21</sub> |
| C. | B<sub>12</sub> |
| D. | B<sub>21</sub> |
| Answer» C. B<sub>12</sub> | |