The energy carried by any wave is proportional to its amplitude squared. For electromagnetic waves, this means intensity can be expressed as \[I_{ave} = \frac{c \epsilon_{0} E_{0}^{2}}{2},\] where \(I...The energy carried by any wave is proportional to its amplitude squared. For electromagnetic waves, this means intensity can be expressed as \[I_{ave} = \frac{c \epsilon_{0} E_{0}^{2}}{2},\] where \(I_{ave}\) is the average intensity in \(W/m^{2}\), and \(E_{0}\) is the maximum electric field strength of a continuous sinusoidal wave. This can also be expressed in terms of the maximum magnetic field strength and in terms of both electric and magnetic fields.
