# Universal wave equation

The universal wave equation is

$\displaystyle v = f{\lambda}$.

- propagation speed ($\displaystyle v$)
- the speed of the wave, measured in metres per second (m/s)
- frequency ($\displaystyle f$)
- the number of cycles completed in one second, measured in hertz (Hz)
- wavelength ($\displaystyle \lambda$)
- the length of one cycle in the wave, measured in metres (m)

We also have a few other equations for dealing with period:

$\displaystyle f{=} \frac{N}{\Delta{} t} , \qquad T = \frac{\Delta{} t}{N} , \qquad f{=} \frac{1}{T}$.

- number of cycles ($\displaystyle N$)
- the number of cycles completed during a time interval (unitless)
- time interval ($\displaystyle \Delta{} t$)
- a specific duration of time, measured in seconds (s)
- period ($\displaystyle T$)
- the time it takes for one cycle to be completed, measured in seconds (s); wavelength is the spatial length, period is the temporal length