A plane EM wave travelling along z-direction is described by→E=E0 sin(kz-ωt)ˆi and →B=B0 sin(kz-ωt)ˆj. Show that:
(i) the average energy density of the wave is given by Uav=14ε0E20+14B20μ0
(ii) the time averaged intensity of the wave is given by Iav=12cε0E20.
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