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The electric field associted with an electromagnetic wave in vacuum is given by `vecE=hati 40 cos(kz=6xx10^(8)t)`, when `E`, `z` and `t` are in volt/m metre and second respectivelyfind the wave vector.A. `2m^(-1)`B. `0.5m^(-1)`C. `6m^(-1)`D. `3m^(-1)` |
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Answer» Correct Answer - A `vec(E) = hati 40 cos (kz - omegat)` `omega = 6xx10^(8) rad//sec` `k = (omega)/(c ) = (6 xx 10^(8))/(3xx10^(8)) = 2m^(-1)` |
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