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What would be maximum wavelength for Brackett series of hydrogen-spectrum?

Options

  1. A74583 Å
  2. B22790 Å
  3. C40519 Å
  4. D18753 Å

Correct answer

C. 40519 Å

Step-by-step solution

For Brackett series, n₁=4, n₂=5,6,7 1 =R ( 1 n₁^2 - 1 n₂^2 ) where R=1.09678 10^7 ~m ⁻¹ , called Rydberg's constant. 1 =R ( 1 4^2 - 1 n₂^2 ) For maximum wavelength, n₂=5 aligned & 1 _ =1.09687 10^7 ( 1 4^2 - 1 5^2 ) & _ =40519 Å aligned

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