The distance between atoms in a solid is typically around 2.0 x 10-10 m. Because this is much smaller than the wavelength of visible light, visible light cannot be used to study the structure of solids. X-rays and electrons are commonly used.
What is the wavelength of an electron with a kinetic energy of 110 eV?
What is the energy of a photon with the same wavelength as the electron of the above problem?