Answer:
Frequency is typically expressed in Hertz.
Explanation:
Frequency is the measure of number of complete cycles completed in a given time interval. In terms of wavelength, frequency is inversely proportional to wavelength with velocity of light being the proportionality constant.
So the unit used to express frequency is Hertz. It can be also termed as the amount of energy a wave carriers corresponding to the number of wavelengths that pass a fixed point in a second.
