First slide

Nature of electromagnetic wave

Question

A plane electromagnetic wave $E_{Z} = 100 c o s (6 \times 10^{8} t + 4 x) v o l t / m$ propagates in a medium of refractive index _____

Moderate

Solution

V= velocity of propagation $= \frac{6 x 10^{8}}{4} m / s = \frac{3}{2} x 10^{8} m / s [∵ v = \frac{ω}{k}]$
$∴ μ = \frac{c}{v} = \frac{3 x 10^{8}}{\frac{3}{2} x 10^{8}} = 2 .$

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