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Einstein coefficients/ equivalent phrase

  1. Mar 7, 2013 #1
    Hi

    Is it technically sound to state that the rate of absorption of photons at a given frequency is proportional to the number of photons at that frequency?

    most statements of the B coefficients seem to focus on molecular state populations, but I'm reasoning that for every state change n1--->n2 there must also be one less photon?

    edit- is it also sound to say the number of photons at that frequency is proportional to the intensity of light? I think this should be correct, just double checking. Brain has switched off.
     
  2. jcsd
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