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Light energy and reactions

  1. May 25, 2017 #1
    AgBr →Ag + Br2
    This reaction takes place in presence of light energy, but why only light ?? Why not electricity, heat or any other forms of energy?
     
  2. jcsd
  3. May 25, 2017 #2

    Borek

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    Staff: Mentor

    Does it take place ONLY in the presence of light?
     
  4. May 25, 2017 #3
    Yes.Only light.
     
  5. May 25, 2017 #4

    Borek

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    Staff: Mentor

    No. Light definitely speeds the reaction up, but it is not the only way to make it happen.
     
  6. May 25, 2017 #5
    Because it involves excited state dynamics. Heat and other forms of energy deals with ground state dynamics (it is theoretically possible to produce excited states with any form of energy, but it is realistically impossible due to the scale of energy required).
     
  7. May 29, 2017 #6
    What are excited state dynamics ??
     
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