What occurs on a CRT screen when it is struck by the electron beam?

When an electron beam strikes a CRT (cathode-ray tube) screen, it causes the phosphorescent coating on the inside of the screen to emit light. This process occurs because the electrons collide with the phosphor particles, exciting them and causing them to emit photons of light, which is perceived as a glow on the screen. The intensity and color of the glow depend on several factors, including the type of phosphor and the energy of the electron beam. This glowing effect is what makes images visible on the screen, allowing us to see the graphics and text produced by the device.