The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action?
A)1.537 eV
B)1.646 eV
C)1.786 eV
D)1.812 eV
E)3.572 eV

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The Answer of The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states involved in laser action?
A)1.537 eV
B)1.646 eV
C)1.786 eV
D)1.812 eV
E)3.572 eV

The Wavelength of a Ruby Laser Is 694