Question

The electric field associated with an e.m. wave in vacuum is given by $\vec{E}=\hat{i}$ 40 cos (kz – 6 × 10⁸t), where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is(a) 2 m⁻¹(b) 0.5 m⁻¹(c) 6 m⁻¹(d) 3 m⁻¹

Answer 1

HERE IS YOUR ANSWER :-

Option No. C

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