1. The problem statement, all variables and given/known data Calculate the kinetic energy of an electron with a wavelength of 1fm 2. Relevant equations DeBroglie's relation [tex]E^2=(pc)^2+\left(mc^2\right)^2[/tex] 3. The attempt at a solution I used debroglies relation to find momentum. plugged that in to find E, and then subtracted the rest mass to find the kinetic energy. Is this even right? Is there a better way to do it?