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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

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On comparing the given equation to
`vecE=a_(0)haticos (omega t-kz), omega=6xx10^(8),k=(2p)/1=w/c`
`k=(omega)/c=(6xx10^(8))/(3xx10^(8))=2m^(-1)`
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