Answer to Question #179310 in Physics for Kubra Gul

Question #179310

In a two levels system, the levels are separated by an energy E2 - E1. Find the ratio of population inversions at room temperature if transition between levels occur at (i) λ = 0.55 μm (ii) λ = 3 μm


1
Expert's answer
2021-04-12T07:03:51-0400

i)


"\\frac{A_{21}}{B_{12}}=\\frac{2h}{\\lambda^3}=\\frac{2(6.6\\cdot10^{-34})}{(0.55\\cdot10^{-6})^3}=7.9\\cdot10^{-15}\\frac{Js}{m^3}"

2)


"\\frac{A_{21}}{B_{12}}=\\frac{2h}{\\lambda^3}=\\frac{2(6.6\\cdot10^{-34})}{(3\\cdot10^{-6})^3}=4.9\\cdot10^{-17}\\frac{Js}{m^3}"


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