Before revision: The relativistic wavelength is given by where is Planck's constant, is the electron rest mass, is the elementary charge, is the speed of light and is an electric potential accelerating the electrons (also called acceleration voltage).
After revision: The relativistic wavelength is given by where is the Planck constant, is the electron rest mass, is the elementary charge, is the speed of light and is an electric potential accelerating the electrons (also called acceleration voltage).