The velocity of electromagnetic radiation in a medium of permittivity \( \varepsilon_{0} \) and permeability \( \mu_{0} \) is given by
(a) \( \sqrt{\frac{\epsilon_{0}}{\mu_{0}}} \)
(b) \( \sqrt{\mu_{0} \in_{0}} \)
(c) \( \frac{1}{\sqrt{\mu_{0} \in_{0}}} \)
(d) \( \sqrt{\frac{\mu_{0}}{\epsilon_{0}}} \)
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