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Collision between electron and H atom

  1. Dec 21, 2013 #1


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    1. The problem statement, all variables and given/known data
    An electron with KE 5eV is incident on a H atom in its ground state. The collision
    A)must be elastic
    b)may be partially elastic
    c)must be completely inelastic
    d)may be completely inelastic

    More than one option may be correct

    2. Relevant equations

    3. The attempt at a solution
    In ground state energy of H atom is -13.6eV. Now the question remains if an electron collides does its KE remains conserved?
  2. jcsd
  3. Dec 21, 2013 #2


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    The energy of the first excited state of the hydrogen is 3.4 eV so the difference becomes 10.2 eV which is larger than 5eV so the collision must be elastic.
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