http://physlab-wiki.com/ 2026-04-20T16:24:09+00:00 http://physlab-wiki.com/ http://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2021-11-05T17:41:06+00:00 Anonymous (anonymous@undisclosed.example.com) http://physlab-wiki.com/physicsdemos/modern_physics/quantum_effects/electron_diffraction?rev=1636148466&do=diff Electron Diffraction A commercial apparatus directs an electron beam at a a polycrystaline graphite target. The resulting diffraction pattern is visible on a phosphor screen. The energy of the incident electrons may be varied to show how the diffraction pattern changes with energy. text/html 2022-07-29T16:13:39+00:00 Anonymous (anonymous@undisclosed.example.com) http://physlab-wiki.com/physicsdemos/modern_physics/quantum_effects/photoelectric_effect?rev=1659125619&do=diff Photoelectric Effect A gold leaf electroscope with a flat zinc electrode at the top is given a negative charge and later discharged by illuminating the zinc electrode with ultraviolet light. The fact that only ultraviolet light causes discharge and not visible room light serves to demonstrate a relationship between the light's wavelength and the discharge rate of the electrode. If the electrode is given a positive charge, the ultraviolet light causes no discharge. This suggests that the fre… text/html 2021-11-05T17:42:26+00:00 Anonymous (anonymous@undisclosed.example.com) http://physlab-wiki.com/physicsdemos/modern_physics/quantum_effects/quantum_dot_fluorescence?rev=1636148546&do=diff Quantum Dot Fluorescence Solutions of quantum dots fluoresce under ultraviolet light. The color of the emitted light corresponds to the size of the quantum dot. L0, F0 PIRA DCS 7AXX.XX