The frequency, or number of cycles per second is measured, then divide the speed of light in meters per second (299,792,458) by frequency to get wavelength in meters.
It depends which part of the radio spectrum you're talking about ! Radio wavelengths measure anything from a few millimetres to many metres ! To determine the wavelength of a radio signal, take the...
Wavelength is simply the length of an individual wave. So waves are measured in metres. Light waves in the visible spectrum are very short, wavelengths from 400nm, for violet, to 700nm for red, a nm,...
By an equation. E=MC^2, or energy of a particle equals its mass times the speed of light squared. V=C/(lambda), or frequency equals the speed of light divided by wavelength. The easiest way is using...