Question

An electromagnetic wave of frequency u = 3.0MHz passes from vacuum into a dielectric medium with permitivity e = 4.0. Then
(a) wavelength is doubled and the frequency remains unchanged
(b) wavelength is doubled and frequency becomes half
(c) wavelength is halved and frequency remains unchanged
(d) wavelength and frequency both remain unchanged.

Answer 1

(c) : During propogation of a wave from one medium to another, frequency remains constant and wavelength changes