| A | B |
|---|
| Photon | Small 'particle' of light |
| Photoelectric | Discharge of charged electric surface by light |
| Work function | Minimum energy needed for an electron to escape a metal surface |
| Stopping voltage | The smallest voltage required to stop the emission of electrons from a surface |
| Threshold frequency | The minumum frequency of light required to produce photoemission from a metal surface |
| de Broglie Hypothesis | That moving matter has an associated wavelength whose wavelength is h/p |
| Matter wave | The wave associated with moving matter |
| Emission sprectrum | Charecteristic line spectra that a particular element will give when excited |
| Absorption spectrum | When light is passed through a material |
| Energy level | For an electron in an atom there are certain allowed amounts of energy where it can be stable - these correspond to energy levels |
| Electron in a box | The idea that an electron around an atom can be described as a standing wave within a specific space |
| Schroedinger model | Description of hydrogen atom energy levels using the wave in a box model |
| Heisenberg principle | There is a limit to the accuracy with which we can measure potion and momentum of a particle. |
| Atomic model | A description of an atom that makes useful predictions |
