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The electric field associated with an em...

The electric field associated with an em wave in vacuum is given by `vecE = 40 cos (kz-6 xx 10^8t)hati`, where E, z and t are in V.`m^(-1)`. meter and seconds respectively. The value of wave vector k is

A

`2m^(-1)`

B

`0.5m^(-1)`

C

`6 m^(-1)`

D

`3 m ^(-1)`

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The correct Answer is:
A
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