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Homework Help: Speed of the electron after the collision

  1. May 12, 2010 #1
    An electron with a speed of 5.50×10^6 m/s, collides with an atom. The collision excites the atom from its ground state (0eV) to a state with an energy of 3.50eV

    What is the speed of the electron after the collision?

    Dont know where to start.
  2. jcsd
  3. May 12, 2010 #2


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    Homework Helper

    Well how much of the initial energy of the electron is transferred to the atom to cause the excitation?
  4. May 12, 2010 #3
    Conservation of Energy:

    [tex]KE_e_i = KE_{e_{f}} + E_{atom} [/tex] assuming that the atom is initially at rest.
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