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The Wavelength of a Ruby Laser Is 694

question 9

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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, 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 × 10<sup>8</sup> m/s,h = 6.626 × 10<sup>-34</sup> J • s,   A)  1.537 eV B)  1.646 eV C)  1.786 eV D)  1.812 eV E)  3.572 eV

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