absorption coefficients

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English-Bulgarian polytechnical dictionary . 2013.

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  • Absorption coefficients of common materials at several frequencies — ▪ Table Absorption coefficients of common materials at several frequencies frequency (hertz) material 125 250 500 1,000 2,000 4,000 concrete 0.01 0.01 0.02 0.02 0.02 0.03 plasterboard 0.20 0.15 0.10 0.08 0.04 0.02 acoustic board 0.25 0.45 0.80… …   Universalium

  • Absorption coefficient — The absorption coefficient α is a property of a material. It defines the extent to which a material absorbs energy, for example that of sound waves or electromagnetic radiation. Wallace Sabine was a pioneer of this concept in acoustics and… …   Wikipedia

  • Coefficients De Fresnel — Pour les articles homonymes, voir Fresnel. Les coefficients de Fresnel, introduits par Augustin Jean Fresnel (1788 1827), interviennent dans la description du phénomène de réflexion réfraction des ondes électromagnétiques à l interface entre deux …   Wikipédia en Français

  • Coefficients de Fresnel — Pour les articles homonymes, voir Fresnel. Amplitudes de réflexion et de transmission d une onde franchissant un dioptre vers un milieu d indice de réfraction supérieur. Les coefficients de Fresnel, i …   Wikipédia en Français

  • Absorption spectroscopy — An overview of electromagnetic radiation absorption. This example discusses the general principle using visible light as a specific example. A white beam source – emitting light of multiple wavelengths – is focused on a sample (the complementary… …   Wikipedia

  • Absorption (electromagnetic radiation) — An overview of electromagnetic radiation absorption. This example discusses the general principle using visible light as specific example. A white beam source emitting light of multiple wavelengths is focused on a sample (the complementary color… …   Wikipedia

  • absorption coefficient — Any of four different coefficients that indicate the ability of a substance to absorb electromagnetic radiation. Absorbance is defined as the logarithm of the ratio of incident and transmitted intensity and thus it is necessary to know the base… …   Dictionary of molecular biology

  • Mass attenuation coefficient — The mass attenuation coefficient is a measurement of how strongly a chemical species or substance absorbs or scatters light at a given wavelength, per unit mass. In addition to visible light, mass attenuation coefficients can be defined for other …   Wikipedia

  • Atomic spectral line — In physics, atomic spectral lines are of two types: * An emission line is formed when an electron makes a transition from a particular discrete energy level of an atom, to a lower energy state, emitting a photon of a particular energy and… …   Wikipedia

  • Attenuation coefficient — For attenuation coefficient as it applies to electromagnetic theory and telecommunications see propagation constant. For the mass attenuation coefficient , see the article mass attenuation coefficient. The attenuation coefficient is a quantity… …   Wikipedia

  • acoustics — /euh kooh stiks/, n. 1. (used with a sing. v.) Physics. the branch of physics that deals with sound and sound waves. 2. (used with a pl. v.) the qualities or characteristics of a room, auditorium, stadium, etc., that determine the audibility or… …   Universalium

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