Question

For stimulated emission which of the following is required.
(a) Excess population
(b) Normal population
(c) Population inversion
(d) none of these ​

Answer 1

(C) Population inversion

Explanation:

Population inversion is the redistribution of nuclear vitality levels that happens in a framework so laser activity can happen. Typically, an arrangement of iotas is in temperature harmony and there are in every case a larger number of particles in low vitality states than in higher ones.

It is a procedure of accomplishing a bigger number of electrons in the higher vitality state than the lower vitality state.

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