Definition

Noun: The release of electrons from a material's surface when it absorbs electromagnetic radiation (typically light or ultraviolet radiation) with sufficient energy.

Usage

This term is used specifically in physics and engineering to describe the fundamental process where light causes electron emission. * The operation of a photoelectric emission device depends on the material's work function. * Einstein's explanation of the photoelectric emission effect was pivotal for quantum mechanics.

Advanced Usage

• In a technical context: The phenomenon is often discussed concerning its threshold frequency and the kinetic energy of the emitted photoelectrons, independent of light intensity.
  • The experiment confirmed that photoelectric emission does not occur if the incident light's frequency is below a specific threshold.

Variants and Related Words

• Photoelectric effect (n): The broader physical phenomenon encompassing photoelectric emission (the ejection of electrons) as well as other related interactions like the photovoltaic effect.
• Photoemission (n): A synonym often used interchangeably with photoelectric emission.
• Photoelectron (n): An electron emitted via photoelectric emission.

Synonyms

• Photoemission

Related Phrases

• Work function: The minimum energy needed to remove an electron from a solid, a critical parameter for photoelectric emission.
• Quantum yield: The ratio of emitted electrons to incident photons in a photoelectric emission process.

Noun

1. the release or absorption of quanta above a certain energy level