For classical light the expression c=Xf holds, where c is the speed of light, f is the frequency, and A is the wavelength. This expression also holds for quantized light (i.e., photons), where the classical wavelength λ is the same as the de Broglie wavelength. Does the expression v=Xf, where v is velocity, hold for electrons if λ is the de Broglie wavelength and f = w/27 is the frequency, such that E = hw? Assume that the electrons have only kinetic energy.