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AP EAMCET2010ChemistryStructure of Atom

Which one of the following transitions of an electron in hydrogen atom emits radiation of the lowest wavelength?

Options

  1. An₂= to n₁=2
  2. Bn₂=4 to n₁=3
  3. Cn₂=2 to n₁=1
  4. Dn₂=5 to n₁=3

Correct answer

C. n₂=2 to n₁=1

Step-by-step solution

As the value of n increases, the difference of energy between successive orbits decreases, ie, E₂-E₁>E₃-E₂>E₄-E₃ and so on... E= h c is lowest for n₂=2 to n₁=1 transition.

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