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MHT CET20239 May 2023Morning ShiftPhysicsAtomic PhysicsActual

The ratio of wavelengths for transition of electrons from 2^ nd orbit to 1^ st orbit of Helium ( He ⁺⁺ ) and Lithium ( Li ⁺⁺ ) is (Atomic number of Helium =2 , Atomic number of Lithium = 3)

Options

  1. A9:4
  2. B4:9
  3. C9:36
  4. D2:3

Correct answer

A. 9:4

Step-by-step solution

Using Rydberg's Formula, aligned & 1 =R_H Z^2 [ 1 n^2 - 1 m^2 ] & 1 Z^2 & _ Li : _ He =9: 4 aligned

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