Chapter 9, Problem 9.56E

Electron microscopes operate on the fact that electrons act as waves. A typical electron kinetic energy is $\text{100}\text{keV}$ ( $\text{1}\text{eV}=\text{1}\text{.602}\times {\text{10}}^{-19}\text{J}$). What is the wavelength of such an electron? (Ignore relativistic effects.)