Q .     The electric field for an electromagnetic wave in free space is `\vec{E}=\vec{i}30\cos(kz-5\times 10^8t)`, where magnitude of `\vec E` is in V/m. The magnitude of wave vector, `k` is:
(velocity of em wave in free space `=3\times 10^8m//s`)

EAMCET 2014
A

`0.46` `rad\ m^{-1}`

B

`3 ` `rad\ m^{-1}`

C

`1.66` ` rad\ m^{-1}`

D

`0.83` ` rad\ m^{-1}`

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