Definition, Meaning, Synonyms & Anagrams | English word EMISSION

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Definitions of EMISSION

1. Something which is emitted or sent out; issue.
2. The act of emitting; the act of sending forth or putting into circulation.
3. (NNSE, broadcasting) A show; a program.

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Examples of Using EMISSION in a Sentence

• For example, beta decay of a neutron transforms it into a proton by the emission of an electron accompanied by an antineutrino; or, conversely a proton is converted into a neutron by the emission of a positron with a neutrino in what is called positron emission.
• Though color is not an inherent property of matter, color perception is related to an object's light absorption, reflection, emission spectra, and interference.
• Emission of greenhouse gases, which absorb and emit radiant energy within the thermal infrared range.
• Fluorescence is one of two kinds of emission of light by a substance that has absorbed light or other electromagnetic radiation.
• Infrared spectroscopy (IR spectroscopy or vibrational spectroscopy) is the measurement of the interaction of infrared radiation with matter by absorption, emission, or reflection.
• A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
• A maser is a device that produces coherent electromagnetic waves (microwaves), through amplification by stimulated emission.
• Active laser medium (also called gain medium or lasing medium), a quantum system that allows amplification of power (gain) of waves passing through (usually by stimulated emission).
• These additives are often used to enhance the appearance of color of fabric and paper, causing a "whitening" effect; they make intrinsically yellow/orange materials look less so, by compensating the deficit in blue and purple light reflected by the material, with the blue and purple optical emission of the fluorophore.
• The photoelectric effect is the emission of electrons from a material caused by electromagnetic radiation such as ultraviolet light.
• Positron emission tomography (PET) is a functional imaging technique that uses radioactive substances known as radiotracers to visualize and measure changes in metabolic processes, and in other physiological activities including blood flow, regional chemical composition, and absorption.
• Positrons can be created by positron emission radioactive decay (through weak interactions), or by pair production from a sufficiently energetic photon which is interacting with an atom in a material.
• The emission from an AGN is powered by a supermassive black hole with a mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.
• Spontaneous emission is ultimately responsible for most of the light we see all around us; it is so ubiquitous that there are many names given to what is essentially the same process.
• Stimulated emission is the process by which an incoming photon of a specific frequency can interact with an excited atomic electron (or other excited molecular state), causing it to drop to a lower energy level.
• The type known as a thermionic tube or thermionic valve utilizes thermionic emission of electrons from a hot cathode for fundamental electronic functions such as signal amplification and current rectification.
• A white dwarf's low luminosity comes from the emission of residual thermal energy; no fusion takes place in a white dwarf.
• A planetary nebula is a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars late in their lives.
• They conduct electric current in the solid state, rather than as free electrons across a vacuum (typically liberated by thermionic emission) or as free electrons and ions through an ionized gas.
• The gain results from the stimulated emission of photons through electronic or molecular transitions to a lower energy state from a higher energy state previously populated by a pump source.

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