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c = fλ ; where c is speed of light, f is frequency in Hertz (sec-1), and λ is wavelength in meters. Take c = 3 x 108 m/s.
(3 x 108 m/sec)/(5.11 x 1011 sec-1) = 5.871 x 10-4 m, or 587.1 μm (micrometers).
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