Questions
An electromagnetic wave of frequency 3 MHz passes from Vacuum into a dielectric medium with relative permittivity = 4.0 Then
a
wave length doubled and frequency remains unchanged
b
wave length is doubled and frequency becomes half
c
wave length is halved and frequency remains unchanged
d
wave length and frequency both remain unchanged
detailed solution
Correct option is C
Frequency of EM wave does not change in medium but wave length and velocity of wave changes.In vacuum, C=1μ0ε0=f λvaccumIn medium, Cmed=1μ0μrε0εr=CμrεrFor dielectric medium, μr=1Cmed=Cεr=C2 ∴εr=4λmed=Cmedf=C2f=λvaccum2Talk to our academic expert!
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The velocity of electromagnetic radiation in a medium of permittivity and permeability is given by
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