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т The electric field of an electromagnetic wave in vacuum is Ē (ř,t) = 12.0 cos(x – y + wt) Ř. a) Find the angular frequency.

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Ě 12.0 1 こ (5,4) Cos fa- y +wt) Â Propagation care vector, R (^-^) [K I = Vitin uz rada Now v2 [x wavelength no Now angular f

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