Answer
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The frequency of electromagnetic radiation refers to the number of wave cycles that pass a given point in space per unit time. It is measured in hertz (Hz), where one hertz represents one cycle per second.
Frequency is not the same as the speed of electromagnetic radiation, which refers to how fast the waves travel through a medium. The speed of electromagnetic radiation in a vacuum is approximately 3.00 × 10^8 meters per second (m/s), represented by the symbol 'c'.
Frequency and speed are connected by the equation:
$c=\lambda v,$
where $c$ is the speed, $v$ is the frequancy and $\lambda$ the wavelength.
