The frequency of electromagnetic waves produced by a charged particle oscillating about its mean position with a frequency of \(10^8\,\text{Hz}\) is
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An oscillating charge radiates electromagnetic waves whose frequency is
\[
\boxed{f_{\text{EM}}=f_{\text{source}}.}
\]
Only the wavelength changes according to
\[
\lambda=\frac{c}{f}.
\]