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坎德拉

坎德拉[1]英文Candela),臺灣叫燭光[2],係發光強度單位,屬於國際單位制七個基本單位之一,符號cd

1979年10月第十六屆國際計量大會將坎德拉定義做:[3]

一個單色輻射光源,喺指定方向上發射頻率540.0154×1012Hz嘅輻射(黃綠色可見光)時,令嗰個方向嘅輻射係(1/683)w/sr嘅光強度。1坎德拉嘅點狀光源所發出嘅總光通量係4π流明

一支普通蠟燭嘅發光強度大約係 1 坎德拉。


參考

[編輯]
  1. http://cd1.edb.hkedcity.net/cd/science/physics/notes_on_units.pdf 《中學物理科實驗補充資料 附錄2》,香港教育署課程發展處(1996)
  2. http://www.bsmi.gov.tw/wSite/ct?xItem=12434&ctNode=4069&mp=7 法定度量衡單位
  3. "Base unit definitions: Candela". The NIST Reference on Constants, Units, and Uncertainty. 喺27 September 2010搵到.
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坎德拉
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