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JEE Main & Advanced Sample Paper JEE Main Sample Paper-38

  • question_answer
    The wave number of first line of Balmer series of hydrogen is \[15200\text{ }c{{m}^{-1}}\] .The wave number of first Balmer line of \[L{{i}^{2+}}\]ion is

    A)  \[15200\,c{{m}^{-1}}\]                       

    B)  \[60800\,c{{m}^{-1}}\]

    C)  \[76000\,c{{m}^{-1}}\]                       

    D)  \[136800\,c{{m}^{-1}}\]

    Correct Answer: D

    Solution :

     V for hydrogen like species \[={{v}_{H}}\times {{Z}^{2}}=15200\times {{3}^{2}}=15200\times 9=136800c{{m}^{-1}}\]


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