The wavelength of coherent ruby laser light is 694 nm. What energy difference exists between the upper excited state involved and the lower unexcited ground state? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^?19 J, and 1 nm = 10?9 m)
a. 0.56 eV
b. 1.79 eV
c. 1.67 eV
d. 2.87 eV
e. 0.35 eV
b
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A _____ has a main mirror called the primary mirror
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