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кандела

The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.

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Penulis

  • PanchoVilla
  • (Smederevska Palanka, Serbia)

  •  (V.I.P) 10022 poin
  • 100% positive feedback
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