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A plane EM wave travelling along z-direc...

A plane EM wave travelling along z-direction is described by `E=E_(0) sin (k z-omega t) hat(i)` and `B=B_(0) sin (k z-omega t) hat(j)`The time averaged intensity of the wave is given by `I_((av))=((1)/(8) c varepsilon_(0) E_(0)^(2)) alpha .` Find `alpha`

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