Matches in DBpedia 2014 for { <http://dbpedia.org/resource/X_unit> ?p ?o. }
Showing items 1 to 31 of
31
with 100 items per page.
- X_unit abstract "The x unit (symbol xu) is a unit of length approximately equal to 0.1 pm (10−13 m). It is used to quote the wavelength of X-rays and gamma rays. Originally defined by the Swedish physicist Manne Siegbahn (1886–1978) in 1925, the x unit could not at that time be measured directly; the definition was instead made in terms of the spacing between planes of the calcite crystals used in the measuring apparatus. One X-unit was set at 1⁄3029.04 of the spacing of the (200) planes of calcite at 18 °C.In modern usage, there are two separate x units, which are defined in terms of the wavelengths of the two most commonly used X-ray lines in X-ray crystallography: the copper X-unit (symbol xu(Cu Kα1)) is defined so that the wavelength of the Kα1 line of copper is exactly 1537.400 xu(Cu Kα1); the molybdenum X-unit (symbol xu(Mo Kα1)) is defined so that the wavelength of the Kα1 line of molybdenum is exactly 707.831 xu(Mo Kα1).The 2006 CODATA recommended values for these units are:1 xu(Cu Kα1) = 1.00207699(28)×10−13 m1 xu(Mo Kα1) = 1.00209955(53)×10−13 m↑ ↑ ↑".
- X_unit wikiPageID "722870".
- X_unit wikiPageRevisionID "541381224".
- X_unit accuracy "5".
- X_unit hasPhotoCollection X_unit.
- X_unit m "1.0021E-13".
- X_unit subject Category:Customary_units_of_measurement.
- X_unit subject Category:Units_of_length.
- X_unit type Abstraction100002137.
- X_unit type CustomaryUnitsOfMeasure.
- X_unit type DefiniteQuantity113576101.
- X_unit type Measure100033615.
- X_unit type UnitOfMeasurement113583724.
- X_unit type UnitsOfLength.
- X_unit comment "The x unit (symbol xu) is a unit of length approximately equal to 0.1 pm (10−13 m). It is used to quote the wavelength of X-rays and gamma rays. Originally defined by the Swedish physicist Manne Siegbahn (1886–1978) in 1925, the x unit could not at that time be measured directly; the definition was instead made in terms of the spacing between planes of the calcite crystals used in the measuring apparatus.".
- X_unit label "Siegbahn".
- X_unit label "X (jednostka długości)".
- X_unit label "X unit".
- X_unit label "X-Einheit".
- X_unit label "X線単位".
- X_unit label "Икс-единица".
- X_unit sameAs X-Einheit.
- X_unit sameAs Siegbahn.
- X_unit sameAs X線単位.
- X_unit sameAs X_(jednostka_długości).
- X_unit sameAs m.035qy8.
- X_unit sameAs Q1542309.
- X_unit sameAs Q1542309.
- X_unit sameAs X_unit.
- X_unit wasDerivedFrom X_unit?oldid=541381224.
- X_unit isPrimaryTopicOf X_unit.