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The electric field associated with an el...

The electric field associated with an electromagnetic wave in vacuum is given by `vecE=40cos(kz-6xx10^(8)t)hati,`
where E, z and t are in volt per meter, meter and second respectively. The value of wave vector k is

A

`6 m^(-1)`

B

`3 m^(-1)`

C

`2 m^(-1)`

D

`0.5 m^(-1)`

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The correct Answer is:
C
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