wave function

wayv FUNK-shuhn /ˈweɪv ˌfʌŋkʃən/
noun phraseC2GRE
formaltechnical

A mathematical description of the quantum state of an isolated quantum system, which contains all the measurable information about the system.

The wave function itself is not directly observable. Its square magnitude gives the probability density of finding a particle at a particular location or in a particular state.

The story behind the word. The term 'wave function' combines 'wave' (from Old English wæġ 'moving water') and 'function' (from Latin functio 'performance, execution'). It was introduced by Erwin Schrödinger in 1926 as a mathematical function, denoted by the Greek letter psi (ψ), that describes the wave-like behavior of particles and contains all the information about a quantum system.

Word relationships

  • state vector: A more abstract mathematical representation in Hilbert space, but conceptually similar to a wave function.

Word family

  • wave (noun): a disturbance that propagates through space and time
  • function (noun): a mathematical relation or expression

Collocations

  • quantum wave function
  • collapse of the wave function
  • wave function collapse

Example sentences

  • "Schrödinger's equation describes how the wave function of a quantum system evolves over time." Explaining the mathematical basis of quantum mechanics.
  • "The wave function allows physicists to calculate the probability of various outcomes when a measurement is performed on a quantum system." Discussing its interpretation.
  • "The wave function is the central mathematical entity in quantum mechanics, encoding the probabilistic nature of quantum reality." A foundational statement.

Memory hook

Think of a 'WAVE' on a pond, but instead of water, it's a mathematical 'FUNCTION' that tells you where a particle is most likely to be found. Math wave describes state

When not to use

This is a highly technical term. Avoid using it outside of discussions specifically about quantum mechanics.

Fun facts

  • The wave function is a complex-valued function, meaning it involves imaginary numbers.
  • The 'collapse' of the wave function upon measurement is one of the most debated and least understood aspects of quantum mechanics.
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