The Wavelength of a Ruby Laser Is 694

Multiple Choice

The wavelength of a ruby laser is 694.3 nm.What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 10⁸ m/s,1 eV = 1.60 × 10^-19 J,h = 6.626 × 10^-34 J ∙ s)

A) 1.54 eV
B) 1.65 eV
C) 1.79 eV
D) 1.81 eV