Answer
The Davisson-Germer experiment was a groundbreaking experiment in physics that demonstrated the wave-particle duality of matter. Conducted by Clinton Davisson and Lester Germer in 1927, the experiment involved firing a beam of electrons at a nickel crystal and observing the resulting diffraction pattern. The pattern obtained was consistent with the predictions of wave theory, indicating that electrons, previously thought of as particles, also exhibit wave-like properties.