A three-level system of atoms has N1 atoms in level E1, N2 in level E2 and N3 in level E3 (N2 > N1 > N3 and E1 2 3). Lasere mission is possible between the levels

A three-level system of atoms has N1 atoms in level E1, N2 in level E2 and N3 in level E3 (N2 > N1 > N3 and E1 2 3). Lasere mission is possible between the levels Correct Answer E<sub>2</sub> → E<sub>1</sub>

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