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Homework Help: Quick question.

  1. Aug 10, 2009 #1
    I am having a problem with this question in a past exam paper...I may just be being a bit of an idiot:

    Show that if an H atom is in its ground state the minimum energy photon it can
    absorb is 1.634x10-18 J.

    I am using The formula:

    En2-En1=hcR∞(1/n12 - 1/n22)

    I keep getting a different value using n1 as 0 and n2 as 1...also using 1 and 2 respectively.
    What am I doing incorrectly?
  2. jcsd
  3. Aug 10, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The ground state is n = 1 (not n = 0).
  4. Aug 10, 2009 #3
    Sorry...I was forgetting to do 1/4 for the final term...It has been a long day.
  5. Aug 10, 2009 #4
    Where is the solved button?
  6. Aug 10, 2009 #5


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    Science Advisor
    Homework Helper

    It dissolved. :biggrin:
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