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JEE Main201910 Apr 2019Evening ShiftChemistryStructure of AtomActual

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9 . The spectral series are:

Options

  1. APaschen and Pfund
  2. BBalmer and Brackett
  3. CLyman and Paschen
  4. DBrackett and Pfund

Correct answer

C. Lyman and Paschen

Step-by-step solution

1 λ 2 = R H 1 n 1 2 - 1 n 2 2 1 λ 1 = R H 1 m 1 2 - 1 m 2 2 As for shortest wavelengths, n 2 and m 2 is ∞ . ∴     λ 1 λ 2 = 9 1 = m 1 2 n 1 2 Now if m 1 = 3 and n 1 = 1 it will justify the statement hence Lyman and Paschen B is correct.

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