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NEET 2010 (AIPMT, Prelims) · Energy of the Electron & Energy Levels

Energy of the Electron & Energy Levels question from NEET 2010 (AIPMT, Prelims)

Q48NEET 2010 · AIPMT · PRELIMSEasy

Energy of the Electron & Energy Levels

The energy of a hydrogen atom in the ground state is −- 13.6 eV. The energy of a He+ ion in the first excited state will be

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Answer: (a)

  1. For a hydrogen-like ion, En=−13.6 Z2n2E_n = -13.6\,\frac{Z^2}{n^2} eV.
  2. He+^+: Z=2Z = 2; first excited state n=2n = 2.
  3. E2=−13.6×44=−13.6E_2 = -13.6 \times \frac{4}{4} = -13.6 eV
  4. So the answer is (a) −13.6-13.6 eV.
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