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Expression for recoil velocity of hydrogen atom during electron transition

  1. Apr 8, 2012 #1
    Hi all
    How does one calculate the recoil velocity of a hydrogen atom when the electron in it jumps from a higher orbit to a lower orbit (say from 3rd to 1st) ?
  2. jcsd
  3. Apr 8, 2012 #2

    Vanadium 50

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    What is the energy of the photon?
    What is the momentum of the photon?
    What is the momentum of the atom?
    What is the velocity of the atom?
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