To calculate wave frequency in physics, one must know about the variables used in different formulas. One formula states that frequency (f) is equal to the wave velocity (v) divided by the wavelength (λ), or f = v/ (λ). If you know the period (T), another formula you can use is that frequency is the reciprocal of the period, or f= 1/T.
There is another formula that states that the angular frequency (ω) is equal to 2 multiplied by pi and the frequency, or ω = 2πf. From this formula, one can calculate frequency (f) by dividing both sides of the equation by 2π to find that f= ω/2π.
The frequency (f) is the number of waves per unit time, and its measurement unit is in Hertz (Hz).
The wavelength (λ) is the distance between one point on a wave to the exact same point on the adjacent wave, and its measurement is in meters. The wave velocity (v) measurement is meters per second. Likewise, the period (T) of a wave is the time it takes for one complete oscillation, and it is measured in seconds.
In order to calculate frequency, one must know at least some of the variables in these formulas.