28: Introduction to Quantum Physics Last updated Nov 5, 2020 Save as PDF 27.4: Implications of Special Relativity 28.1: History and Quantum Mechanical Quantities Page ID16213 ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy28.1: History and Quantum Mechanical QuantitiesElectrons are emitted from matter that is absorbing energy from electromagnetic radiation, resulting in the photoelectric effect.28.2: Applications of Quantum MechanicsFluorescence and phosphorescence are photoluminescence processes in which material emits photons after excitation.