In the He-Ne laser, the lasing transition goes from the 20.66 eV state in Ne to a lower state. The wavelength of the laser photons is 633.0 nm. What is the lower state of the lasing transition?
A. the He ground state
B. the Ne ground state
C. the 20.61 eV excited stated of He
D. the 18.70 eV excited state of Ne
E. the 4.660 eV excited state of Ne
D. the 18.70 eV excited state of Ne
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A. 116
B. 26.6
C. -26.6
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