1.

Electric field in one electromagnetic wave, propagating in vacuum is E=40 cos(kz - 6xx10^(8)t)hat(i) (where all the values are in SI units).Then value of wave vector of this wave is ……. .

Answer»

`2m^(-1)`
`0.5 m^(-1)`
`6 m^(-1)`
`3m^(-1)`

Solution :COMPARING given EQUATION with
`vec(E ) =E_(0)cos (KZ - OMEGA t)hat(i)`
weget`omega = 6xx10^(8)` rad/s
Now, we know `c=(omega)/(k)rArr k=(omega)/(c ) =(6xx10^(8))/(3xx10^(8))`
`THEREFORE k = 2`rad/m


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