Electron diffraction

Recall when we were discussing light that when light is shone through a diffraction grating a diffraction pattern of alternating bright and dark spots is found. This is a sure sign of the wave nature of light, as it involves diffraction and interference, which are phenomena unexplainable in a particle model. In the 1930s beams of electrons were shone through a diffraction grating, and what emerged was indeed a diffraction pattern, illustrating directly the wave nature of electrons.