A) release of a photon when electron comes back from higher to lower energy level.
B) release of two photons by absorbing one photon when electron comes back from higher to lower energy level.
C) absorption of a photon when electron moves from lower to higher energy level.
D) None of the above
Correct Answer: B
Solution :
| Option [b] is correct. |
| Explanation: Einstein explained the stimulated emission. In an atom, electron may move to higher energy level by absorbing a photon. |
| When the electron comes back to the lower energy level, it releases the same photon. This is called spontaneous emission. This may also so happen that the excited electron absorbs another photon, releases two photons and returns to the lower energy state. This is known as stimulated emission. |
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