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Home > Art, Film & Photography > Units of Luminous Intensity: Candela, Candlepower, Carcel Burner
Units of Luminous Intensity: Candela, Candlepower, Carcel Burner

Units of Luminous Intensity: Candela, Candlepower, Carcel Burner


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About the Book

Chapters: Candela, Candlepower, Carcel Burner. Source: Wikipedia. Pages: 20. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: The candela (pronounced or, symbol: cd) is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function (a standardized model of the sensitivity of the human eye to different wavelengths, also known as the luminous efficiency function). A common candle emits light with a luminous intensity of roughly one candela. If emission in some directions is blocked by an opaque barrier, the emission would still be approximately one candela in the directions that are not obscured. The word candela means candle in Latin and Italian. Like other SI base units, the candela has an operational definitionit is defined by a description of a physical process that will produce one candela of luminous intensity. Since the 16th General Conference on Weights and Measures (CGPM) in 1979, the candela has been defined as: The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10 hertz and that has a radiant intensity in that direction of watt per steradian. The definition describes how to produce a light source that (by definition) emits one candela. Such a source could then be used to calibrate instruments designed to measure luminous intensity. The candela is sometimes still called by the old name candle, such as in foot-candle and the modern definition of candlepower. The frequency chosen is in the visible spectrum near green, corresponding to a wavelength of about 555 nanometers. The human eye is most sensitive to this frequency, when adapted for bright conditions. At other frequencies, more radiant intensity is required to achieve the sa...More: http: //booksllc.net/?id=5385


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Product Details
  • ISBN-13: 9781158506149
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • Sub Title: Candela, Candlepower, Carcel Burner
  • Width: 229 mm
  • ISBN-10: 1158506147
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Spine Width: 1 mm
  • Weight: 45 gr


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