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 $

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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 $



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