E2 activity: Davisson-Germer experiment
You've seen that light can behave as either a wave or a particle. What about matter: do electrons ever behave like waves? The experiment Davisson and Germer set up an “electron gun” to fire high-energy electrons at a piece of nickel. They (eventually! scientific discoveries happen in an unpredictable way) realized that their nickel sample was a crystal, which means the atoms were arranged in a pattern. They set up an...