An electromagnetic wave of frequency f = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity εr=4.0 and relative permeability μr =1.0 Then
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a
Wavelength is halved and frequency remains unchanged
b
Wavelength is doubled and frequency becomes half
c
Wavelength is doubled and the frequency remains unchanged
d
Wavelength and frequency both remain unchanged
answer is A.
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Detailed Solution
Frequency remains constant during refraction vmed=1μ0∈0×μr∈r=1μ0∈0×4=c2 Now, λmedλair=vmedvair=c/2c=12 ∴Wavelength is halved and frequency remains unchanged.