This document discusses the relationship between the speed of light (c), frequency (f), and wavelength (lambda) of electromagnetic radiation. It defines wavelength as being equal to the speed of light divided by the frequency. It also mentions decibels (dB) and power (p) as relating to wavelength, but does not provide further context.

4. c.
c
f
lambda
lambda = frac{c}{f}
dB
p
dB