Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: About The Bohr Model of the Hydrogen Atom

  1. Jun 24, 2010 #1
    1. The problem statement, all variables and given/known data

    What energy (in eV) is required to remove the remaining electron from a singly ionized helium
    atom, He+ (Z = 2)?
    (a) 3.40 eV (c) 27.2 eV (e) 76.9 eV
    (b) 13.6 eV (d) 54.4 eV

    2. Relevant equations

    Ei - Ef = hf

    3. The attempt at a solution

    Ef: the 1st level
    Ei: the 2nd level
  2. jcsd
  3. Jun 24, 2010 #2
    Do you know the relation between E and Z & n.

    [tex]E \propto Z[/tex]
    [tex]E \propto \frac{1}{{n}^{2}}[/tex]

    For the ground state(n=1) of hydrogen(Z=1), E = -13.6eV

    Here Z=2 & n=1.
    Last edited: Jun 25, 2010
  4. Jun 24, 2010 #3
    Thanks a lot (:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook