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The Wavelength of a Ruby Laser Is 694

question 18

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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, 1 eV = 1.6022 × 10-19 J)


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