Candela: Difference between revisions
Jump to navigation
Jump to search
imported>Milton Beychok (wiki link) |
mNo edit summary |
||
| Line 10: | Line 10: | ||
==References== | ==References== | ||
<references /> | <references />[[Category:Suggestion Bot Tag]] | ||
Latest revision as of 11:01, 24 July 2024
The candela is the SI unit of luminous intensity. It is defined since 1979 as The luminous intensity, in a given direction, of a [light] 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.[1]
An earlier definition, adopted in 1967, clarifying a definition adopted in 1946, was the luminous intensity, in the perpendicular direction, of a surface of 1⁄600,000th square meter of a blackbody at the temperature of freezing platinum under a pressure of 101,325 newtons per square meter [2042 K].
Sources
- candela. Sizes.com (2007-03-08). Retrieved on 2007-05-11.
References
- ↑ International Bureau of Weights and Measures From the website of the International Bureau of Weights and Measures.