Physics - EM Waves Question with Solution | TestHub

The electric field associated with an electro magnetic wave in vacuum is given by $\mathbf{E}=\mathbf{i}$ $40\cos \left(kz-6\times 10^{8}t\right)$, where $E$, $z$ and $t$ are in volt/m, metre and second respectively. The value of wave vector $k$ isNEET 2012 (Screening)