Q. Light is an electromagnetic wave. Its speed in vacuum is given by the expression
A) $\sqrt{\mu_{o}\varepsilon_{o}}$
B) $\sqrt{\frac{\mu_{o}}{\varepsilon_{o}}}$
C) $\sqrt{\frac{\varepsilon_{o}}{\mu_{o}}}$
D) $\frac{1}{\sqrt{\mu_{o}\varepsilon_{o}}}$
Explanation
(d) $\mu_{0} = 4\pi \times 10^{- 7},\ \varepsilon_{0} = 8.85 \times 10^{- 12}\frac{N - m^{2}}{C^{2}}$
So $c = \frac{1}{\sqrt{\mu_{0}\varepsilon_{0}}} = 3 \times 10^{8}\frac{meter}{second}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.