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The electric field associated with an e.m. wave in vacuum is given by E = 140 cos (kz - 6 10t), where E, z

The electric field associated with an e.m. wave in vacuum is given by E = 140 cos (kz - 6 10t), where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is: (a) 2 m (c) 6 m (b) 0.5 m (d) 3 m

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