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The electric field associted with an ele...

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 respectively
find the wave vector.

A

`6m^(-1)`

B

`3m^(-1)`

C

`2 m^(-1)`

D

`0.5 m^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
Equation of Electromagnetic wave is `E=E_(0) cos (kz-omega t)` and speed of EM wave `V=(omega)/(k)`
By comparing `k=omega//v=(6xx10^(8))/(3xx10^(8))=2 m^(-1)` is the wave vector.
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