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

Light is an electromagnetic wave. Its speed in vacuum is given by the expression
  1. $\sqrt{\mu_0 \varepsilon_0}$
  2. $\sqrt{\frac{\mu_0}{\varepsilon_0}}$
  3. $\sqrt{\frac{\varepsilon_0}{\mu_0}}$
  4. $\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$

Solution

Speed of light (EM wave) in vacuum or air is given as $c=\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$ where, $\mu_0=$ permeability of free space and $\quad \varepsilon_0=$ permittivity of free space.

Asked in: AP EAMCET 2020 (22 Sep Shift 2)

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