The Wavelength of a Ruby Laser Is 694

question 18

Multiple Choice

The wavelength of a ruby laser is 694.3 nm.What is the energy difference between the two energy states involved in laser action? (c = 2.9979 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.6022 × 10^-19 J)

• A)1.537 eV
• B)1.646 eV
• C)1.786 eV
• D)1.812 eV
• E)3.572 eV

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