14695477
Description
Flashcards by Molli Forber, updated more than 1 year ago
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Created by Molli Forber
over 6 years ago
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| Question | Answer |
| frequency | Waves per second |
| Wavelength | Distance between peaks |
| Photon | A quanta of energy |
| EV | 1 electron volt is defined as the energy required to accelerate an electron through a potential difference of 1 volt |
| Excitation | An electron is given energy to move up to a higher energy level. An electron has not been lost |
| Ionisation | An electron is removed from an atom. Ionisation is the minimum energy required to remove the electron from the atom |
| Fluorescence | When a substance absorbs short wavelength electromagnetic radiation and re-emits as a longer wavelength radiation |
| Fluorescent tube | A type of light bulb that gives off visible light when it's inner coating fluoresces. This is made of prosphor |
| Thermionic emission | When free electrons are released from a heated filament |
| Fluorescent | Absorbs UV, gives visible light straight away |
| Phosphorescent | Absorbs UV, gives visible light but not straight away, stores it (used for glow in the dark) |
| Photoelectric effect | When electromagnetic radiation is incident on the surface of a metal, the energy of a single photon is absorbed by a single electron. This electron is the released from the metal surface. These are called photoelectrons, energy is conserved in this interaction |
| Threshold frequency | The minimum frequency of a single incident photon required to release a single electron from the surface of the metal |
| Threshold wavelength | The maximum wavelength of a single incident photon required to release a single electron from the surface of the metal |
| Work function | The minimum energy required to release a single electron from the surface of the metal |
| Stopping Voltage | The minimum p.d. required to just stop the electrons from being emitted from the photocathode |
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