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Paragraph: In a mixture of H - H ⁺ gas ( He ⁺ . is singly ionised He atom), H atoms and He ⁺ ions are excited to their respective first excited states. Subsequently, H atoms transfer their total excitation energy to He ⁺ ions (by collisions). Assume that the Bohr model of atom is exactly valid. Question: The quantum number n of the state finally populated in He ⁺ ions is

Options

  1. A2
  2. B3
  3. C4
  4. D5

Correct answer

C. 4

Step-by-step solution

Energy given by H -atom in transition from n=2 to n=1 is equal to energy taken by He ⁺ atom in transition from n=2 to n=4 . correct option is (c).

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