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Homework Help: Quantum - E field of atom

  1. Sep 13, 2007 #1
    1. The problem statement, all variables and given/known data

    Using the values of [tex]\hbar[/tex], the electron mass and the electron charge, find the characteristic value of the electric field in an atom, in statvolts / cm (cgs).

    2. Relevant equations

    [tex]r_n = \frac{n^2 h^2}{4 {\pi}^2 m e^2}[/tex]

    3. The attempt at a solution

    So I wasn't really sure what to do with this problem...would you just try to find the E field classically? I tried doing

    [tex] E = \frac{e}{r^2}[/tex]

    [tex] E = \frac{\pi^2 m ^2 e ^ 5}{n^2 \hbar^4} [/tex]

    But that doesn't look right to me...esp the units...
  2. jcsd
  3. Sep 14, 2007 #2


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    Science Advisor
    Homework Helper

    Is r_{n} expressed in cgs units ? If so, then it's okay. E_{at} in the Bohr model is good.
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