MCQOPTIONS
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MCQOPTIONS
| 1. |
The energy levels of which ion/atom/molecule are responsible for lasing action? |
| A. | Al<sup>3+</sup> |
| B. | Cr<sup>3+</sup> |
| C. | Al<sub>2</sub>O<sub>3</sub> |
| D. | Cr<sub>2</sub>O<sub>3</sub> |
| Answer» C. Al<sub>2</sub>O<sub>3</sub> | |