Dismiss Notice
Join Physics Forums Today!

Homework Help: K Alpha Energy Question

  1. Feb 28, 2007 #1
    1. The atomic number of osmium is Z = 76. According to the Bohr model, what is the energy (in joules) of a K X-ray photon?

    2. ?

    3. The reason I left relavent eqns blank is because I used the following:
    En = -(13.6) Z^2/n^2
    subtracting one from Z before squaring and converting to joules gave me an incorrect answer of En = 1.226 x 10^-14 J.

    I do not believe I am using the right equation but it is the only one my book offers for this.

    Please help.

  2. jcsd
  3. Feb 28, 2007 #2
    ok I found it by going through the wavelength.

    Is that the fastest way?
  4. Mar 1, 2007 #3


    User Avatar
    Science Advisor
    Homework Helper

    The "wave number" formula is a consequence of the formula giving the enrgy levels. So i'd say "no".