An electromagnetic wave of frequency v = 3.0MHz passes from vacuum into a dielectric medium with permittivity = 4.0. Then

JEE Main 2004 Physics question

An electromagnetic wave of frequency MHz passes from vacuum into a dielectric medium with permittivity . Then

Answer: (3)

Frequency is fixed by the source and does not change across media. The refractive index , so the speed

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Question ID VK-038348