1. The problem statement, all variables and given/known data Calculate the wavelength of a photon having the same momentum as an electron moving at 1.0 106 m/s. The answer is supposed to be 0.73 nm. 2. Relevant equations Ek = (m*v^2)/2 Ek = hf - W p = E/c = hf/c = h/[tex]\lambda[/tex] 3. The attempt at a solution I first found Ek using the kinetic energy formula, using the speed of the electron given in the question and the mass of the electron. I can't quite figure out where to go next.