Question: 1. write derivation for a more general two-level system where both levels are degenerate and show that the principle of detailed balance is still valid.

1. write derivation for a more general two-level system where both levels are degenerate and show that the principle of detailed balance is still valid.

2. Derive the relationship between Einstein's A and B coefficients for a non-degenerate two-level system(derivation for a more general two-level system where both levels are degenerate.)

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