Question

Optical fibers allow the fast transmission of vast amounts of data. In one type of fiber, the wavelength of transmitted light is 1.3×103 nm1.3 \times 10^3 \mathrm{~nm}. (a) What is the frequency of the light? (b) Fiber optic cable is available in 12 km12 \mathrm{~km} lengths. How long will it take for a signal to travel that distance assuming that the speed of light in the cable is the same as in a vacuum?

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The frequency (ν\nu) of a wave is simply the number of wave peaks that pass by a given point per unit time, usually expressed in units of waves per second (s1\text{s}^{-1}), or hertz (Hz; 1 Hz = 11 s1\text{s}^{-1}).

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