Question

With what purpose was famous Davisson-Germer experiment with electrons perfomed ?

Answer 1

Davisson-Germer experiment confirmed the wave nature of electrons.

Answer 2

The famous Davisson and Germers Experiment was performed with electrons and observations were made that electrons scattered by the surface of a crystal of nickel metal, displayed a diffraction pattern.
This showed and confirmed the wave nature and behaviour of electrons.

Thus this experiment helped other physicists like De Broglie to further work on their postulates and hypothesis over light and radiation.