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Homework Help: What is the velocity of the hydrogen atom after absorbing the photon?

  1. May 31, 2013 #1
    A stationary hydrogen atom with a mass of 1.67 x10^-27 kg absorbs a photon of light with an energy of 10.2eV.What is the velocity of the hydrogen atom after absorbing the photon?

    This is my question:

    Is it true that the atom has no speed since all the energy is completely absorbed at the energy level 10.2eV?
     
  2. jcsd
  3. May 31, 2013 #2

    tiny-tim

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    hi dannie! :smile:

    hint: momentum :wink:
     
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