Let \(E_{n} = \frac{- 1m e^{4}}{8 \varepsilon_{0}^{2}n^{2} h^{2}} \) be the energy of the \(n^\text{th}\) level of H-atom. If all the H-atoms are in the ground state and radiation of frequency \(\frac{\left(\right. E_{2} - E_{1} \left.\right)}{h}\) falls on it, then:
| (a) | it will not be absorbed at all. |
| (b) | some of the atoms will move to the first excited state. |
| (c) | all atoms will be excited to the \(n = 2\) state. |
| (d) | no atoms will make a transition to the \(n = 3\) state. |
| 1. | (b, d) | 2. | (a, d) |
| 3. | (b, c, d) | 4. | (c, d) |
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