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In a mixture of H – He+ gas (He+ is singly ionized 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.
The ratio of the kinetic energy of the n = 2 electron for the H atom to that of He+ ion is:

  1. fraction numerator 1 over denominator 4 end fraction    
  2. fraction numerator 1 over denominator 2 end fraction    
  3. 1    
  4. 2    

The correct answer is: fraction numerator 1 over denominator 4 end fraction

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In a mixture of H – He+ gas (He+ is singly ionized 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.
The quantum number n of the state finally populated in He+ ions is :

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