Which of the following is essential for the laser action to occur between two energy levels of an atom?
A)the lower level is metastable
B)there are more atoms in the upper level than in the lower level
C)there are more atoms in the lower level than in the upper level
D)the lower level is the ground state
E)the lasing material is a gas

Question

Quizplus · Accepted Answer

For laser action to occur, a condition known as population inversion must be met, where there are more atoms in the excited (upper) state than in the lower energy state. This is essential for stimulated emission to dominate over absorption, allowing the laser to amplify light.

Which of the Following Is Essential for the Laser Action