Optics Question 325
Question: Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be
[MH CET 2003]
Options:
A) $ 13.6\times 10^{6}m/s $
B) $ 1.8\times 10^{2}m/s $
C) $ 3.6\times 10^{8}m/s $
D) $ 1.8\times 10^{8}m/s $
Show Answer
Answer:
Correct Answer: D
Solution:
$ v=\frac{c}{\sqrt{{\mu _{r}}{\varepsilon _{r}}}}=\frac{3\times 10^{8}}{\sqrt{1.3\times 2.14}}=1.8\times 10^{8}m/sec $
