Question: Given a two-level atomic system where level-2 is more energetic than the ground state level-1, what is the meaning of the expression When in thermal

Given a two-level atomic system where level-2 is more energetic than the ground state level-1, what is the meaning of the expression

dN2 B124,N1 – B214,N2 – A2¡N2 dt - %3D

When in thermal equilibrium show that

A21N2 + B21uvN2 = B12uvN1

dN2 B124,N1 B214,N2 A2N2 dt - %3D

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