Wavelength is the distance between the crests of a wave. For example if you see the frequency 150text MHz and need to know what band it is in divide the speed of light by the frequency. Frequency Formula Frequency is the number of cycles in a unit of time.
The formula for wavelength is l m c f l c f wave speed c ms frequency f Hz.
It is equal to the velocity of the wave divided by the frequency. F 42 1014 Hz. Wave speed v is measured in metres per second ms frequency f is measured in Hertz Hz wavelength l is measured in. The frequency of a wave is the number of wave crests passing a point per unit time.