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An electromagnetic wave of frequency f = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity $ε_{r} = 4.0$ and relative permeability $μ_{r} = 1.0$ Then

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Wavelength is halved and frequency remains unchanged

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Correct option is A

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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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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Ready to Test Your Skills?

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An electromagnetic wave of frequency f = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity $ε_{r} = 4.0$ and relative permeability $μ_{r} = 1.0$ Then