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ENTRANCE TEST – 2011 :: Discussion
| 17. | In Helium-Neon laser, population inversion of _________ atoms is achieved which emit radiations, when they are stimulated to fall at lower level. | |
| A. | Neon | |
| B. | Helium | |
| C. | Helium and Neon | |
| D. | Chromium | |
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