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Homework Help: (Check solution) Frequency of light after electron capture?

  1. Nov 8, 2015 #1
    1. The problem statement, all variables and given/known data

    An alpha particle: He++ captures an electron of a given kinetic energy. To conserve energy, it emits light, hf. How would one calculate the frequency?
    2. Relevant equations
    En = (Z^2 *-13.6eV)/(n^2)

    3. The attempt at a solution
    Calculate En. Then KE = Photon + En. Solve for v given KE and En?
  2. jcsd
  3. Nov 9, 2015 #2


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    2017 Award

    Staff: Mentor

    If the electron energy is high (or if the initial alpha particle is moving), you might want to consider the motion of the nucleus as well.
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