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Question

Consider the following electronic energy level diagram of H atom. Photons associated with shortest and longest wavelengths would be emitted from the atom by the transitions labelled

 
  1. D and C respectively
  2. C and A respectively
  3. C and D respectively
  4. A and C respectively


Solution

The correct option is C C and D respectively
For  H  atom, E1=13.6 eV,E2=3.4 eV,E3=1.5 eV,
E4=0.85 eV and E=0

For (A)
E4=0.85eV

For (D)
E43=0.65eV

For  (C) 
E42=2.55eV

For (B)
E32=1.6eV

Thus C corresponds to maximum energy and hence least wavelength and D corresponds to least energy and longest wavelength. 

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