The de Broglie wavelength

de Broglie asserted, by way of a somewhat obscure argument, that what were thought of as material particles of rest mass m, might in fact, have an associated wavelength given by....

... where p is the linear momentum mv.

The de Broglie wavelength of the electrons in the cathode ray tube discussed elsewhere in this section, with velocity 3.2x10⁷ m/s is given by....

... in the X-ray region for EM waves.

Electrons with this range of de Broglie wavelengths are diffracted by the regular array of atoms in crystals, (specifically graphite), which are separated by ~10^-10meters. Teltron has a tube, (which we have), that shows an electron/graphite diffraction pattern changing size with changing electron velocity!