Discussion
The speed of electromagnetic waves in a medium depends on the
Answer: C
The speed depends on the permittivity and permeability of the medium.
The speed of electromagnetic waves in a medium is
\[ v = \frac{1}{\sqrt{\mu\varepsilon}} \]
which reduces to \(c = \frac{1}{\sqrt{\mu_{0}\varepsilon_{0}}}\) in vacuum. The intensity, phase and energy of the wave do not change its speed, and reflectivity is a property of a surface, not of propagation through the medium.
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