The speed of electromagnetic waves in a vacuum is given by which expression?

Solution

1. Maxwell's equations predict the existence of electromagnetic waves.
2. The speed of these waves in vacuum is derived from the constants ${\mu }_0$ and ${ϵ}_0$.
3. The formula is $c=\frac{1}{\sqrt{{\mu }_0{ϵ}_0}}$.
4. Hence the answer is (A).