The frequency formula frequency is the number of times an event occurs repeatedly in a unit of time. It is usually represented by the symbol f or ν in physics. Adopting the International System of Units, its unit is Hertz (Hz). If an event occurs repeatedly n times in τ, then the frequency of this event occurs as f = n / τ Hz. And because the period is defined as the minimum time interval in which a recurring event occurs, the frequency can also be expressed as the reciprocal of the period: 
Where T is the period.
The frequency formula of a wave, when measuring the frequency of sound, electromagnetic waves (such as radio waves or light), telecommunication signals, or other waves, represents the number of waveform repetitions per second. If the wave is a sound, the frequency measures the characteristics of the note.
The frequency is inversely proportional to the wavelength. The frequency f is equal to the velocity v of the wave divided by the wavelength λ: 
In the vacuum, the speed of the electromagnetic wave is the speed of light c in the vacuum, and the equation becomes: 
When a wave passes from one medium to another, the frequency does not change and the wavelength and phase velocity change.
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