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The speed of electromagnetic waves in a vacuum is given by the expression involving the permeability of free space $\mu_0$ and permittivity of free space $\epsilon_0$. What is the correct formula?
- A.$c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}$
- B.$c = \sqrt{\mu_0 \epsilon_0}$
- C.$c = \mu_0 \epsilon_0$
- D.$c = \sqrt{\frac{\epsilon_0}{\mu_0}}$
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Correct answer: A — $c = \frac{1}{\sqrt{\mu_0 \epsilon_0}}$
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