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ENTRANCE TEST – 2010 :: Discussion
| 19. | Velocity of electron moving in first orbit of hydrogen is | |
| A. | 2.19 x 107 m/sec | |
| B. | 2.18 x 107 m/sec | |
| C. | 2.2 x 108 m/sec | |
| D. | 2.19 x 106 m/sec | |
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