Electromagnetic WavesHard
Question
An electromagnetic wave of frequency v = 3.0 MHz passes from vacuum into a dielectric medium with permittivity ε = 4.0. Then
Options
A.wavelength is doubled and the frequency remains unchanged
B.wavelength is doubled and frequency becomes half
C.wavelength is halved and frequency remains unchanged
D.wavelength and frequency both remain unchanged.
Solution
Refractive index, μ = 
= 2
Speed and wavelength of wave will becomes half, the frequency remaining unchanged (frequency of a wave depends on the source as due to refraction, it is assumed that the energy is conserved. hv remains the same)
= 2Speed and wavelength of wave will becomes half, the frequency remaining unchanged (frequency of a wave depends on the source as due to refraction, it is assumed that the energy is conserved. hv remains the same)
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