Stimulated emission/Ne-He-laser

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Homework Statement


Here's simplified energy level diagram of Ne-He-laser. Calculate the corresponding wavelengths of
a, b, and c.

Homework Equations


ΔE=hf=hc/λ

The Attempt at a Solution


λ=ch/ΔE gives wrong answer.
 
Attachments
  • Handwritten energy level diagram with two vertical axes labelled eV and E: He on the left with levels at 20,6 and 19,8 eV, Ne on the right with levels at 20,6, 19,8 and 16,6 eV, a 0 baseline, excitation arrows, a collision arrow, and red arrows labelled a, b and c between Ne levels.
    stimulated emission.jpg
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