Light is an electromagnetic wave. Its speed in vacuum is given by the expression
- A$\sqrt{\mu_0 \varepsilon_0}$
- B$\sqrt{\frac{\mu_0}{\varepsilon_0}}$
- C$\sqrt{\frac{\varepsilon_0}{\mu_0}}$
- D$\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$
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