1.

Electric field of one plane progresive electromagnetic wave is E_(Z)=100 cos (6xx10^(8)t + 4x)Vm^(-1). Then refreactive index of medium pf propagation would be …..

Answer»

`1.5`
`2.0`
`2.4`
`4.0`

Solution :Comparing GIVEN equation with `E_(Z)=E_(0)COS (omega t)+kx)` we GET,
`omega =6xx10^(8)` rad/s
k = 4 rad/s
Required refractive index,
`mu=(c )/(V)=(c )/(omega//k)=(ck)/(omega)=(3xx10^(8)xx4)/(6xx10^(8))=2`


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