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Electric field of one plane progresive e...

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 …..

A

`1.5`

B

`2.0`

C

`2.4`

D

`4.0`

Text Solution

Verified by Experts

The correct Answer is:
B
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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