Population inversion

1. The problem statement, all variables and given/known data

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

2. Relevant equations

Not sure.

3. The attempt at a solution

I have no idea where to start with this one. Can someone please point me in the right direction? There were no forumulas given. Thank you!!


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