- 1(current)
Q. No.A set of atoms in an excited state decays:
| 1. | in general to any of the states with lower energy. |
| 2. | into a lower state only when excited by an external electric field. |
| 3. | all together simultaneously into a lower state. |
| 4. | to emit photons only when they collide. |
Subtopic: Â Spectral Series |
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The Balmer series for the H-atom can be observed:
| a. | if we measure the frequencies of light emitted when an excited atom falls to the ground state |
| b. | if we measure the frequencies of light emitted due to transitions between excited states and the first excited state |
| c. | in any transition in a H-atom |
| d. | as a sequence of frequencies with the higher frequencies getting closely packed |
1. (b, c)
2. (a, c)
3. (b, d)
4. (c, d)
Subtopic: Â Spectral Series |
 65%
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- 1(current)
Q. No.
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