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Many of our cabled devices use light in optical fibers to send information across long distances....

Many of our cabled devices use light in optical fibers to send information across long distances.
Suppose the light has a frequency of 5 x1014 s-1 and the material in the cable has an index of refraction n = 2.4. What is the wavelength of the light in the fiber optic cable. (in nanometers)

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