emission : Idioms & Phrases

Index

emission spectrum

  • noun spectrum of electromagnetic radiation emitted by a self-luminous source
WordNet

Emission theory

  • (Physics), the theory of Newton, regarding light as consisting of emitted particles or corpuscles. See Corpuscular theory, under Corpuscular.
Webster 1913

field emission

  • noun the emission of electrons that are stripped from parent atoms by a high electric field
WordNet

field-emission microscope

  • noun electron microscope used to observe the surface structure of a solid
WordNet

greenhouse emission

  • noun a gas that contributes to the greenhouse effect by absorbing infrared radiation
    greenhouse gas.
WordNet

infrared emission

  • noun electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves
    infrared light; infrared radiation; infrared.
WordNet

nocturnal emission

  • noun ejaculation during sleep (usually during a dream)
WordNet

photoelectric emission

  • noun the release or absorption of quanta above a certain energy level
WordNet

positron emission tomography

  • noun using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain)
    PET.
WordNet

positron emission tomography scanner

  • noun a tomograph that produces cross-sectional X-rays of metabolic processes in the body
    PET scanner.
WordNet

radio emission

  • noun an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m
    radio wave; radio radiation.
WordNet

secondary emission

  • noun the emission of electrons from a surface that is bombarded by higher energy primary electrons
WordNet

thermal emission

  • noun the emission of electrons from very hot substances
    thermal emission.
WordNet

thermionic emission

  • noun the emission of electrons from very hot substances
    thermal emission.
WordNet