• Corpus ID: 37988936

7 Visible Light and UV Radiation

  title={7 Visible Light and UV Radiation},
  author={Johan Emelian Moan},
  • J. Moan
  • Published 2004
  • Environmental Science
The sun is the most important source of visible and ultraviolet (UV) radiation. Even though the distance from the sun to the Earth is large – about 150×10 km – the fluence rate of solar radiation on Earth, the solar constant, is about 1 360 W/m 2 . Approximately 40% of this radiation is reflected back into space. The remaining 60% is the driving force of all life on Earth. A number of pigments have been developed by life to harvest solar energy: chlorophyll a (350-700 nm), phycoerythrin (45-580… 
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