Quantum Physics
Definitions: Quantum Physics
Exam question
State what is meant by a photon.
9702/42 · Feb/Mar 2025 · Q8(a)
Model answer
A discrete quantum of energy of electromagnetic radiation.
Exam question
State what is meant by the photoelectric effect.
9702/42 · May/Jun 2025 · Q9(a)
Model answer
The emission of electrons from a metal surface when electromagnetic radiation is incident on it.
Exam question
State what is meant by the work function energy of a metal.
9702/41 · Oct/Nov 2022 · Q8(a)
Model answer
The minimum photon energy required to remove an electron from the surface of the metal.
Exam question
Explain the term threshold wavelength.
9702/42 · Feb/Mar 2024 · Q7(c)(i)
Model answer
The maximum wavelength of incident electromagnetic radiation that causes electrons to be emitted from the metal surface.
Exam question
State what is meant by the de Broglie wavelength.
9702/41 · May/Jun 2025 · Q8(a)
Model answer
The wavelength associated with a moving particle.