Universal wave equation

The universal wave equation is

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

propagation speed ($v$)

the speed of the wave, measured in metres per second (m/s)

frequency ($f$)

the number of cycles completed in one second, measured in hertz (Hz)

wavelength ($\lambda$)

the length of one cycle in the wave, measured in metres (m)

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

$f=\frac{N}{\mathrm{\Delta }t}\text{,}$ $T=\frac{\mathrm{\Delta }t}{N}\text{,}$ $f=\frac{1}{T}\text{.}$

number of cycles ($N$)

the number of cycles completed during a time interval (unitless)

time interval ($\mathrm{\Delta }t$)

a specific duration of time, measured in seconds (s)

period ($T$)

the time it takes for one cycle to be completed, measured in seconds (s); wavelength is the spatial length, period is the temporal length