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The energy of an electron in n th orbit of hydrogen atom is - 13.6 n ⁡ 2 eV. ⁡ Energy required to excite the electron from the first orbit to the third orbit is

Options

  1. A10.2     J
  2. B12.09     J
  3. C12.09     eV
  4. D13.6     eV

Correct answer

C. 12.09     eV

Step-by-step solution

Calculate difference in energies of 3rd orbit and 1st orbit. Use, - 13.6 n ⁡ 2 E = E 3 - E 1 = - 13.6 3 2 — - 13.6 1 2 E = - 1.51 + 13.6 = 12.09 e V

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