Question

what do you mean by population inversions ?​

Answer 1

Answer:

Population inversion, in physics, the redistribution of atomic energy levels that takes place in a system so that laser action can occur. Normally, a system of atoms is in temperature equilibrium and there are always more atoms in low energy states than in higher ones.

Explanation:

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Answer 2

Answer:

Population inversion is the state in which the number of atoms in higher energy state is more than those in lower energy state. It is required in laser so that stimulated emission is more probable than induced absorption.