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MHT CET 2026 (17 Apr, Shift 2) · Energy of the Electron & Energy Levels

Energy of the Electron & Energy Levels question from MHT CET 2026 (17 Apr, Shift 2)

Q6MHT CET 2026 · 17 APR · SHIFT 2Medium

Energy of the Electron & Energy Levels

In Bohr's atomic model, the energy of the electron is 'E' in the second orbit of hydrogen atom. So the energy of the electron in the third orbit of helium atom (Z=2)(Z = 2) will be

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Answer: (b)

  1. En=−13.6 Z2n2E_n = -13.6\,\frac{Z^2}{n^2} eV.
  2. H, n=2n = 2: E=−13.64E = -\frac{13.6}{4}.
  3. He, Z=2Z = 2, n=3n = 3: E′=−13.6×49E' = -13.6 \times \frac{4}{9}.
  4. E′E=4/91/4=169\frac{E'}{E} = \frac{4/9}{1/4} = \frac{16}{9}
  5. So the answer is (b) 16E9\frac{16E}{9}.
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