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Homework Help: Optical Spectroscopy and Atomic Structure

  1. Nov 18, 2008 #1
    1. The problem statement, all variables and given/known data

    Calculate the energy and radius for each of the five lowest (n = 1,2,3,4,5) electron orbits in a Helium atom with only one electron. Enter the energy as a positive value in units of "eV" and the radius in units of "nm". Hint: The Helium nucleus has 2 protons so Z = 2 and the ground state energy of Helium will be E0 = k(Ze)2/2r.

    If n=2, find E and r1

    2. Relevant equations

    3. The attempt at a solution

    I know how to answer the question, but I need help with finding the ground Energy E0 of Helium. I keep ending up with incorrect answers using that equation given in the problem, can anyone help me solve for the ground energy of Helium?
  2. jcsd
  3. Nov 18, 2008 #2


    User Avatar
    Homework Helper
    Gold Member

    Your using the correct formula.

    In order to find your mistake, I'll have to see your calculations.
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