Quantum Definitions

Descrição

A level Physics (Quantum) FlashCards sobre Quantum Definitions, criado por Molli Forber em 18-08-2018.
Molli Forber
FlashCards por Molli Forber, atualizado more than 1 year ago
Molli Forber
Criado por Molli Forber mais de 6 anos atrás
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Resumo de Recurso

Questão Responda
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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