The Wavelength of Coherent Ruby Laser Light Is 688

question 59

Multiple Choice

The wavelength of coherent ruby laser light is 688.3 nm.What energy difference exists between the upper excited state involved and the lower unexcited ground state? (h = 6.63 x 10^-34 J*s,c = 3.00 x 10⁸ m/s,1 eV = 1.60 x 10^-19 J,and 1 nm = 10^-9 m)

• A)1.75 eV
• B)1.81 eV
• C)1.86 eV
• D)1.94 eV

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