(a) Approximately how fast should an electron move so it has a wavelength that makes it useful to measure the distance between adjacent atoms in typical crystals (about 0.10 nm)?
(b) What is the kinetic energy of the electron in part (a)?
(c) What would be the energy of a photon of the same wavelength as the electron in part (b)?
(d) Which would make a more effective probe of small-scale structures, electrons or photons? Why?