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Q.
An electromagnetic wave of frequency $v=3.0 MHz$ passes from vacuum into a dielectric medium with permitivity $\varepsilon=4.0 .$ Then
Communication Systems
Solution:
During propagation of a wave from one medium to another, frequency remains constant and wavelength changes
$\mu=\sqrt{\frac{\varepsilon}{\varepsilon_{0}}}=\sqrt{4}=2$
Since $\mu \propto \frac{1}{\lambda}$