Flashcards
Quantum Definitions
Cards in this deck (16)
- 1frequencyWaves per second
- 2WavelengthDistance between peaks
- 3PhotonA quanta of energy
- 4EV1 electron volt is defined as the energy required to accelerate an electron through a potential difference of 1 volt
- 5ExcitationAn electron is given energy to move up to a higher energy level. An electron has not been lost
- 6IonisationAn electron is removed from an atom. Ionisation is the minimum energy required to remove the electron from the atom
- 7FluorescenceWhen a substance absorbs short wavelength electromagnetic radiation and re-emits as a longer wavelength radiation
- 8Fluorescent tubeA type of light bulb that gives off visible light when it's inner coating fluoresces. This is made of prosphor
- 9Thermionic emissionWhen free electrons are released from a heated filament
- 10FluorescentAbsorbs UV, gives visible light straight away
- 11PhosphorescentAbsorbs UV, gives visible light but not straight away, stores it (used for glow in the dark)
- 12Photoelectric effectWhen 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
- 13Threshold frequencyThe minimum frequency of a single incident photon required to release a single electron from the surface of the metal
- 14Threshold wavelengthThe maximum wavelength of a single incident photon required to release a single electron from the surface of the metal
- 15Work functionThe minimum energy required to release a single electron from the surface of the metal
- 16Stopping VoltageThe minimum p.d. required to just stop the electrons from being emitted from the photocathode
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- A level Physics (Quantum) Flashcards on Quantum Definitions, created by Molli Forber on 18/08/2018.
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- Molli Forber
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