quantum physics Flashcards
Photon definition
quantum physics
- a light quantum
- a quantum of electromagnetic radiation energy
Photoelectric Effect definition
quantum physics
the emission of electrons from a metal surface when the surface is irradiated with electromagnetic radiation above the threshold frequency
Threshold Frequency definition
quantum physics
the minimum frequency of the incident radiation for electrons to be emitted from a metal surface irradiated with electromagnetic radiation
Work Function (energy) of a Metal definition
quantum physics
the minimum amount of energy necessary to remove an electron from the surface of the metal
Stopping Potential definition
quantum physics
the minimum negative potential to stop all the electrons from reaching the collector plate
Ground State definition
quantum physics
the lowest energy configuration in which the atom is the most stable
Excited State / Excitation definition
quantum physics
when the electron(s) in an atom are at higher energy level(s) rather than at the lowest energy level(s)
De-excitation definition
quantum physics
when an atom in an excited and unstable state transits back to its lower energy level(s)
Ionisation Energy definition
quantum physics
the amount of energy required to remove an electron from an atom (in gaseous state)
Emission Line Spectrum
quantum physics
the series of distinct coloured lines against a dark background
Absorption Line Spectrum
quantum physics
the series of distinct dark lines against a continuous spectrum
