Question

# Optical fibers allow the fast transmission of vast amounts of data. In one type of fiber, the wavelength of transmitted light is $1.3 \times 10^3 \mathrm{~nm}$. (a) What is the frequency of the light? (b) Fiber optic cable is available in $12 \mathrm{~km}$ 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?

Solution

Verified
The frequency ($\nu$) 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 ($\text{s}^{-1}$), or hertz (Hz; 1 Hz = $1$ $\text{s}^{-1}$).