Davisson-Germer Experiment (1927)
Idea: Interference effects can be seen by scattering electrons scattered from a crystal.
Interference occurs when the path difference between scatterings from different layers is an integral number of wavelengths.
- Since the momentum p = mv of the electrons can be measured, the wavelength predicted by de Broglie is known - ??= h / p = h / mv. One can test for interference by changing the speed (i.e. the kinetic energy mv2) of the electrons.
- Result: Electrons show interference like waves with wavelength ??= h / p