# An electromagnetic wave of frequency 3 MHz passes from vacuum into a dielectric medium with permitivity

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An electromagnetic wave of frequency 3 MHz passes from vacuum into a dielectric medium with permitivity εr  = 4 , then :–

(a) the wavelength and frequency both remain unchanged

(b) the wavelength is doubled and the frequency remains unchanged

(c) the wavelength is doubled and the frequency becomes half

(d) the wavelength is halved and the frequency remains uchanged

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Correct option (d) the wavelength is halved and the frequency remains uchanged

Explanation:

Frequency remains unchanged with change of medium.