If \( v=\frac{1}{\sqrt{\mu \varepsilon}} \) gives the speed of an electromagnetic wave in a mate...

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If \( v=\frac{1}{\sqrt{\mu \varepsilon}} \) gives the speed of an electromagnetic wave in a material medium, \( \mu \) the permeability of the medium and \( \varepsilon \) its permittivity. What is its effect on frequency?
(A) Frequency increases gradually
(B) Frequency decreases
(C) Frequency first increases and then decreases to zero
(D) Frequency remain unchanged
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