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NEET2018ChemistryStructure of AtomActual

Wavelength of a particular transition for H atom is 400 ~nm . What can be the wavelength of He ⁺ for the same transition?

Options

  1. A400 ~nm
  2. B100 ~nm
  3. C1600 ~nm
  4. D200 ~nm

Correct answer

B. 100 ~nm

Step-by-step solution

1 =R_ H ( 1 n₁^2 - 1 n₂^2 ) Z^2 On dividing equation (i) by (ii), we get _ He ⁺ = 400 2^2 = 400 4 =100 ~nm

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