Maths, Physics Revision Physicss Maths Physics Physics A Level Physics Home Maths Maths Revision hut Wave particle duality Something like this Electon Diffraction pattern When electrons are passed through a crystal structure of atoms in a vacuum (Such as an aluminium target in a  Cathode ray oscilloscope)   diffraction pattern will be shown on the  Screen. This implies that electrons are  travelling as waves both waves and particles (electrons) Are said  to have Wave Particle Duality Louise de Broglie came up with an equation Known as the Wave- Particle Duality Theorem (or de Broglie equation)  (λ) = h/mv h = Planck’s constant 6.63 x 10-34 Js  mv is the momentum of the particle (Mass x velocity, sometimes given the symbol p)