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Question

An electromagnetic wave of frequency v = 3 MHz passes from vacuum into dielectric medium with permittivity ϵ=4.0 Then


A

the wavelength is doubled and the frequency becomes half.

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B

the wavelength is doubled and the frequency remains the same.

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C

the wavelength and frequency both remain unchanged.

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D

the wavelength is halved but the frequency remains the same.

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Solution

The correct option is D

the wavelength is halved but the frequency remains the same.


When an electromagnetic wave passes through a medium, the frequency remains unchanged.

Now, c1ϵ

Hence, the speed of light becomes half in the medium and so wavelength is also halved.


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