What is the frequency of light with a wavelength of NM?

What is the frequency of light with a wavelength of NM?
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All light travels in the speed of light in vacuum, that is300,000 km/sec. The relevant formula is C = f*lambda, where C isthe speed of light, f is the frequency and lambda the wavelength.Therfore, f = C/lambda. Here lambda = 632.8nm, so f = 4.741E14 or474 terahertz.The color of this light, incidentally, is red. Please see thelinks. They are beautiful, anyway.
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