An electromagnetic wave passes from vacuum into a dielectric medium with relative electrical permittivity \(\dfrac{3}{2}\) and relative magnetic permeability \(\dfrac{8}{3}\). Then, its
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For electromagnetic waves entering a new medium:
\[
f=\text{constant}
\]
Always calculate the new speed first using
\[
v=\frac{c}{\sqrt{\mu_r\varepsilon_r}}
\]
and then use
\[
\lambda=\frac{v}{f}.
\]