 | United States. National Bureau of Standards - 1986 - 880 lapas
...Photometry and Radiometry (CCPR) and redefined the SI unit of luminous intensity as follows: "The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 X 1012 hertz and has a radiant intensity in that direction of 1/683 watts per steradian."... | |
 | Anthony French - 1988 - 416 lapas
...molecules, ions, electrons, other particles, or specified groups of particles. candela (cd) The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540X 1012 hertz and that has a radiant intensity in that direction of ( 1/683) watt per... | |
 | R. W. Haywood - 1990 - 56 lapas
...of length (9th CGPM, 1948). Luminous intensity: The unit of luminous intensity called the candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 X i012 hertz and that has a radiant intensity in that direction of (1/683) watt per... | |
 | Adventure - 1992 - 66 lapas
...optical radiation power, the 16th CGPM adopted in 1979 the following new definition: 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 (1/683) watt per... | |
 | Pierre A. Buser, Michel Imbert - 1992 - 572 lapas
...(in the SI system) the "new candle" or candela (cd). [The present definition of the candela (cd) is: "Luminous intensity in a given direction, of a source that emits monochromatic radiation of frequency 540-1012 Hz, of which the energy intensity in that direction is 1/683 W-sr"1" (Sixteenth... | |
 | L Brown, B Pippard, A Pais - 1995 - 832 lapas
...that a complete change was needed and adopted an entirely new definition of the candela The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian.... | |
 | Barry Taylor - 1995 - 84 lapas
...time the nature of the quantity whose unit is the mole. A.8 Candela (16th CGPM, 1979) The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x IO 12 hertz and that has a radiant intensity in that direction of (1/683) watt per... | |
 | P. S. Neelakanta - 1995 - 616 lapas
...kC. mol of photons whose frequency is 10^ Hz has energy of about 39.90 kJ. Candela — The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of (1/683) watt per... | |
 | Richard Cohen - 1998 - 226 lapas
...understood that the carbon 12 atoms are unbound, at rest, and in their ground state. candela: The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 xlO12 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian... | |
 | Stuart B. Palmer - 1995 - 916 lapas
...unit, related to the intensity of light. The SI unit of luminous intensity is the candela, defined as the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of (1/683) watt per... | |
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The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 1012 hertz and that has a radiant intensity in that direction of (1/683) watt per steradian. 
