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Question

An electromagnetic wave of v = 3MHz passes from vacuum into dielectric medium with ϵ=4.0ϵ0. Then:


A

wavelength is doubled and frequency becomes half

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B

wavelength is doubled and frequency same.

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C

wavelength and frequency both remain unchanged

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D

wavelength is halved but frequency remains same.

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Solution

The correct option is D

wavelength is halved but frequency remains same.


C = 1μϵ
here; ϵ=μϵ0
hence; the speed is halved. Since, the frequency depends on the source and C = f λ; wavelength will be halved.


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