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Bohr's model

  1. Nov 5, 2014 #1
    If the hydrogen gas is supposed to emit photons when the electrons undergo excitation, then why did the gas absorb energy earlier and got the electrons excited?
  2. jcsd
  3. Nov 5, 2014 #2


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    Staff: Mentor

    Absorption of photons, collisional excitation, etc.
  4. Nov 5, 2014 #3


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    Science Advisor

    Electrons absorb photons when excited. Photons are emitted when electrons lose energy.
  5. Nov 5, 2014 #4


    Staff: Mentor

    The real answer requires QFT and takes into account the quantum vacuum:
    http://www.physics.usu.edu/torre/3700_Spring_2014/What_is_a_photon.pdf [Broken]

    Last edited by a moderator: May 7, 2017
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