Q 12-08-155JEE MainJEE Main 2021 (24 Feb, Shift 1)Easy
An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are 2. Its velocity in this medium is ______ $\times10^7\ \text{m s}^{-1}$.
Numerical value type. Enter your answer.
Answer: 15
$v = \dfrac{c}{\sqrt{\mu_r\varepsilon_r}} = \dfrac{3\times10^8}{\sqrt{2\times2}} = 1.5\times10^8 = 15\times10^7\ \text{m s}^{-1}$
Solution by Sreeraj P, M.Sc Physics