Answer
The wave-like behavior of electrons, as predicted by de Broglie's hypothesis, was experimentally confirmed in 1927 through the groundbreaking experiments conducted by Clinton Davisson and Lester Germer. Their study, known as the Davisson-Germer experiment, involved the scattering of electrons from a nickel crystal and observed interference patterns characteristic of waves, thus providing empirical evidence for the dual nature of electrons as both particles and waves.