In the form you can customize it with the desired value and by choosing from ms kms and miless as measurement units. If the wavelength is given in nanometers you need to convert this. In this formula f represents frequency V represents the velocity of the wave and l.
Wave velocity ms Wavelength m Frequency Hz.
L Lambda Wavelength in meters. The corresponding frequency will be in the frequency field in GHz. Calculate wavelength with the wavelength equation. Using the Frequency-Wavelength Calculator.