b) Electron diffraction

a) electron diffraction, including experimental evidence of this effect 

b) diffraction of electrons travelling through a thin slice of polycrystalline graphite by the atoms of graphite and the spacing between the atoms

electrons can diffract and create interference patterns

• they move through space with wave-properties

electron diffraction

• electron gun → fires electrons at a thin slice of polycrystalline graphite

• electrons pass through the gaps between the carbon atoms

• gaps between carbon atoms → close to the wavelength of an electron

• electrons diffract