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KEAM 2020 Physics and Chemistry Solved Paper

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Question : 39

Total: 120

If an electromagnetic wave of frequency 5‌MHz travels from vacuum into a dielectric medium of electrical permittivity εr=4,then‌its(take‌µr=1)

wavelength is halved and the frequency remains unchanged
wavelength and frequency are both doubled if
wavelength and frequency both remain unchanged
wavelength is doubled but the frequency remains unchanged
wavelength remains unchanged but the frequency is doubled

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