<Tr> <Td> Fundamentals (show) <Ul> <Li> Complementarity </Li> <Li> Decoherence </Li> <Li> Entanglement </Li> <Li> Energy level </Li> <Li> Measurement </Li> <Li> Nonlocality </Li> <Li> Quantum number </Li> <Li> State </Li> <Li> Superposition </Li> <Li> Symmetry </Li> <Li> Tunnelling </Li> <Li> Uncertainty </Li> <Li> Wave function (collapse) </Li> </Ul> </Td> </Tr> <Ul> <Li> Complementarity </Li> <Li> Decoherence </Li> <Li> Entanglement </Li> <Li> Energy level </Li> <Li> Measurement </Li> <Li> Nonlocality </Li> <Li> Quantum number </Li> <Li> State </Li> <Li> Superposition </Li> <Li> Symmetry </Li> <Li> Tunnelling </Li> <Li> Uncertainty </Li> <Li> Wave function (collapse) </Li> </Ul> <Li> Wave function (collapse) </Li> <Tr> <Td> Experiments (show) <Ul> <Li> Afshar </Li> <Li> Bell's inequality </Li> <Li> Davisson--Germer </Li> <Li> Double - slit </Li> <Li> Elitzur--Vaidman </Li> <Li> Franck--Hertz </Li> <Li> Leggett--Garg inequality </Li> <Li> Mach--Zehnder </Li> <Li> Popper </Li> </Ul> <Ul> <Li> Quantum eraser (delayed - choice) </Li> </Ul> <Ul> <Li> Schrödinger's cat </Li> <Li> Stern--Gerlach </Li> <Li> Wheeler's delayed - choice </Li> </Ul> </Td> </Tr>

When do electrons move to a higher energy level