Question: In order to achieve population inversion between two states that are separated by an energy difference of 3.5 eV, what wavelength of pumping light should

In order to achieve population inversion between two states that are separated by an energy difference of 3.5 eV, what wavelength of pumping light should be used?

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54. To achieve population inversion between two atomic states separated by an energy of 3.5 eV, what wavelength of pumping light should be used?

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