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A plane electromagnetic wave Ez = 100cos (6xx10^8t+ 4x)V/m propagates in a medium. Find the refractive index of the medium. |
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Answer» Solution :Comparing with the equation, `E=E_0 COS (omegat+kx)` we get , `omega=6xx10^(8) s^(-1),k=4m^(-1)` `THEREFORE` The velocity of the electromagnetic wave in the MEDIUM `v=omega/k=(6xx10^8)/4=1.5xx10^8 m.s^(-1)` The refractive index of the medium , `mu=c/v=(3xx10^8)/(1.5xx10^8)=2` |
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