1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Emission spectrum for Helium

  1. Sep 25, 2010 #1
    1. The problem statement, all variables and given/known data
    The numbers following are the results of a lab experiment to find the spectral lines of Helium in a gas discharge tube. The lines I got were roughly:

    703nm, 660nm, 590nm, 500nm, 490nm, 470nm, 450nm.

    The question is, what possible electron transitions could the electrons have went though?

    2. Relevant equations
    Energy level of hydrogen like atoms is given by:

    E= [(-Z^2)(R)]/n^2


    3. The attempt at a solution

    I'm getting some crazy answers like transitions from n=20 to n=5, or n=9 to n=5. Intuitively, this does not seem to be correct, although my intuition is based on the hydrogen atom which has visible lines only at n=x to n=2.

    So... is this correct?
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted