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A plane electromagnetic wave $E_{z} = 100 \cos (6 \times 10^{8} t + 4 x) V / m$ propagates in a medium of refractive index

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Correct option is B

Given that EZ=100cos⁡6×108t+4×V/m Comparing this equation with the equation of plane electromagnetic wave,Ez=E0cos⁡(ωt+kx) we get ω=6×108 and k=4 Now v=ωk=6×1084=3×1082m/s μ=cv=3×1083×108/2=2

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A plane electromagnetic wave Ez=100cos⁡6×108t+4xV/m propagates in a medium of refractive index

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A plane electromagnetic wave $E_{z} = 100 \cos (6 \times 10^{8} t + 4 x) V / m$ propagates in a medium of refractive index