SATHEE: Optics Question 271

Optics Question 271

Question: Light is an electromagnetic wave. Its speed in vacuum is given by the expression

[CBSE PMT 1993; MP PMT 1994; RPMT 1999; MP PET 2001; Kerala PET 2001; AIIMS 2002]

Options:

A) $\sqrt{μ_{o} ε_{o}}$

B) $\sqrt{\frac{μ_{o}}{ε_{o}}}$

C) $\sqrt{\frac{ε_{o}}{μ_{o}}}$

D) $\frac{1}{\sqrt{μ_{o} ε_{o}}}$

Show Answer

Answer:

Correct Answer: D

Solution:

$μ_{0} = 4 π \times 10^{- 7}, ε_{0} = 8.85 \times 10^{- 12} \frac{N - m^{2}}{C^{2}}$

So $c = \frac{1}{\sqrt{μ_{0} ε_{0}}} = 3 \times 10^{8} \frac{m e t e r}{s e c} .$

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