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[ppt] Photo chemistry



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Beer’s Law

The intensity of a ray of monochromatic light decreases exponentially as the concentration of the absorbing medium increases.
More dissolved substance = more absorption and less transmittance
A = ε C l 

Laws of Photo-chemistry

1.Only light that is absorbed can produce
   photochemical change (Grotthus, Draper)
2.A molecule absorbs a single quantum of light
  is becoming excited (Stark, Einstein)





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