IB Physics HL: Topic 12 – Einstein’s explanation and Matter waves

This Lecture covers Topic 12
Einstein’s explanation: Einstein suggested that light consists of photons, which are quanta or bundles of energy and momentum.
Matter waves: In 1923, Louis de Broglie suggested that to any particle of momentum p, there corresponds a wave of wavelength

Davisson and Germer Experiment: Davisson and Germer investigated the scattering of low-energy electrons from a nickel surface. Initial results showed that, for fixed electron energy, the intensity of the electron beam decreased sharply as the scattering angle θ increased.