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MPSC State Service 2019 · GS · Question 3 of 97

Energy of the electron revolving around the nucleus in second orbit is - 3.4 V. What is its energy in third orbit?

Physics

  1. A- 1.51 J
  2. B- 3.4 eV
  3. C- 1.51 eVCorrect
  4. D- 13.6 eV

Answer: C. - 1.51 eV

Explanation

Electron energy scales as 1/n², so E₃ = −3.4 × (2/3)² ≈ −1.51 eV.

Source: MPSC Rajyaseva Prelims 2019 – GS Paper I (Set A), official paper

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