JEE Main & Advanced JEE Main Online Paper (Held On 08 April 2018)

  • question_answer
    If the series limit frequency of the Lyman series is\[{{\text{v}}_{L}},\] then the series limit frequency of the Pfund series is: [JEE Main Online 08-04-2018]

    A)  \[{{v}_{L}}/16\]                   

    B)  \[{{v}_{L}}/25\]

    C)  \[25\,\,{{v}_{L}}\]                

    D)  \[16\,\,{{v}_{L}}\]

    Correct Answer: B

    Solution :

    \[h{{v}_{L}}=13.6{{z}^{2}}\left( \frac{1}{1}-\frac{1}{\infty } \right)\] \[hv=13.6{{z}^{2}}\left( \frac{1}{25}-\frac{1}{\infty } \right)\] \[\Rightarrow v=\frac{{{v}_{L}}}{25}\]


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