Question
Show that for a continuous sinusoidal electromagnetic wave, the peak intensity is twice the average intensity ($I_o = 2I_{\textrm{ave}}$, using either the fact that $E_o = \sqrt{2}E_{\textrm{rms}}$, or $B_o = \sqrt{2}B_{\textrm{rms}}$, where "rms" means average (actually root mean square, a type of average).