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单词 mechanical equivalent of light
释义 mechanical equivalent of light
[mi`kan·ǝ·kǝl i`kwiv·ǝ·lǝnt ǝv `līt]
OPTICS
The ratio of the radiant power emitted by a monochromatic light source whose wavelength is that at which the sensitivity of phototopic vision is greatest (about 555 nanometers), to its luminous flux measured in lumens.
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