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Old 01-19-2009, 04:54 AM
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Arrow atom & nuclei
the ground stste energy of H- atom is -13.6 eV. the energy needed to ionise H- atom from its second excited state is
  1. 1.51 eV
  2. 3.4 eV
  3. 13.6 eV
  4. 12.1 eV
Last edited by hriday; 02-19-2009 at 04:25 PM.
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Old 04-28-2010, 04:06 AM
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I think answer of this question is 12.1 eV.

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