1. The problem statement, all variables and given/known data What is the de Broglie wavelength of this electron? Given is 500 eV 2. Relevant equations KE= 1/2 mv^2 1 eV=1.602x19^-19 J 3. The attempt at a solution I converted the 500 eV to 8.01x10^-17 via the given conversion. Now I'm stuck.