The standard unit for frequency is the hertz Hz deļ¬ned as events or cycles per second. The formula used to calculate the frequency is. Because frequency determines the number of times a wave oscillates and it can be expressed as f 1 t.
Every point on the wave returns to the same value after one period since a wave undergoes one oscillation during one period.
For a sinusoidal wave represented by the equation. Angular frequency 2 p period of oscillation. Frequency f is defined to be the number of events per unit time. In long-distance transmission systems the coherence time may be reduced by propagation factors such as dispersion scattering and diffraction.