Ratio of Wave lengths of series limit in Balmer series to the series limit in Lyman series of Hydrogen atom is

  1. A

    4 : 1

  2. B

    1 : 4

  3. C

    2 : 1

  4. D

    1 : 2

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    Solution:

    (1) ν-=1λ=RH 1n12-12; n1=2 for Balmer series;  n2= for series limit ν-= RH4 ; (2) ν-=1λ=RH 1n12-12; n1=1 for Lyman series;  n2= for series limit ν-= RH ; Ratio of wavelengths of (1) to (2) = 4RH : 1RH ; 

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