In the operation of a laser
A) stimulated emission occurs.
B) there is a population inversion.
C) the excited state will tend to be metastable.
D) the photons emitted will have transitioned to the ground state.
E) For the answers (a), (b), (c), and (d), three are correct and one is incorrect.

Question

Quizplus · Accepted Answer

In the operation of a laser, stimulated emission occurs (A), there is a population inversion (B), and the excited state is typically metastable (C), making these statements correct. However, statement D is incorrect because the photons emitted during laser operation are a result of electrons transitioning from a higher energy state to a lower one, not necessarily to the ground state.

In the Operation of a Laser