Answer:

The relation between the wavelength , to the frequency f, of electromagnetic waves with the unique speed v (in vacuum) is, in fact, extremely simple: v= f. The wavelength of any wave is the speed of the wave divided by the frequency. The same expression applies whether it's the speed of sound in air or the speed of light in vacuum. It has nothing to do with the speed of light being a physical constant.

So, obviously, the wavelength relates inversely to the corresponding frequency, =vf (and, vice versa, f=v).