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Emission (radiocommunications), a radio signal (usually modulated) emitted from a radio transmitter Emission coefficient , a coefficient in the power output per unit time of an electromagnetic source Emission line , or "spectral line", a dark or bright line in an otherwise uniform and continuous spectrum
An emission spectrum is formed when an excited gas is viewed directly through a spectroscope. Schematic diagram of spontaneous emission. Emission spectroscopy is a spectroscopic technique which examines the wavelengths of photons emitted by atoms or molecules during their transition from an excited state to a lower energy state.
absorption / emission of a photon, absorption of several photons (so called multiphoton ionization); e.g., quasi-monochromatic laser light. There are several rules that dictate the transition of an electron to an excited state, known as selection rules. First, as previously noted, the electron must absorb an amount of energy equivalent to the ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 6 March 2025. Gas in an atmosphere with certain absorption characteristics This article is about the physical properties of greenhouse gases. For how human activities are adding to greenhouse gases, see Greenhouse gas emissions. Greenhouse gases trap some of the heat that results when sunlight heats the ...
Global net-zero emissions describe the state where emissions of greenhouse gases due to human activities and removals of these gases are in balance over a given period. It is often called simply net zero. [2] In some cases, emissions refers to emissions of all greenhouse gases, and in others it refers only to emissions of carbon dioxide (CO 2). [2]
An emission intensity (also carbon intensity or C.I.) is the emission rate of a given pollutant relative to the intensity of a specific activity, or an industrial production process; for example grams of carbon dioxide released per megajoule of energy produced, or the ratio of greenhouse gas emissions produced to gross domestic product (GDP).
(The feds say real-world fuel economy is usually 20%–30% lower than CAFE standards. ) However, Duffy says these goalposts will do nothing but increase costs for automakers and consumers alike.
Together, wave and particle effects fully explain the emission and absorption spectra of EM radiation. The matter-composition of the medium through which the light travels determines the nature of the absorption and emission spectrum. These bands correspond to the allowed energy levels in the atoms.