Suppose I have some electrons in a wire which are moving up and down, in sync, where the position is given by $x = \sin(2\pi ft)$. At times $n/f$, there is no acceleration and therefore not emitting any photons. So, the intensity of the radiation I see will vary over time with a frequency of $f$.
If I understand correctly, the individual photons themselves also have frequency. Does the frequency of the photons also equal $f$?
