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Line Spectra series for Ionized Helium

  1. Feb 23, 2012 #1
    1. The problem statement, all variables and given/known data
    Adjacent wavelengths 251.1 nm and 238.6 nm are found in one series of transitions among the radiations emitted by ionized helium.

    1.) Find the value of n0 for this series:
    Possible answers:
    n0= 1, 2, 3, 4, 5

    2.) Find the series limit:
    Possible answers:
    λlimit= 91.13 nm, 205.0 nm, 364.5 nm, 569.5 nm

    2. Relevant equations
    λ=λlimit*n2/(n2-n20) where (n=n0+1, n0+2,...)
    Nuclear charge for Ionized Helium Z=2

    3. The attempt at a solution
    I think it need to find maximum energy of the helium atom and use the relation E =hc/λ => λ= hc/E to find the series limit, λlimit, then plug in various values of n via trial and error until i get the right answer. I am however struggling trying to figure out how to find the maximum energy of the atom (assuming this is actually the way to approach the problem).

    Thanks for your time.
  2. jcsd
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