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Q.

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.
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