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WB JEE Medical WB JEE Medical Solved Paper-2009

  • question_answer
    For the Paschen series the values of \[{{n}_{1}}\]and\[{{n}_{2}}\]     in     the     expression\[\Delta E=Rhc\left( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} \right)\]are

    A)  \[{{n}_{1}}=1,{{n}_{2}}=2,3,4,...\]

    B)  \[{{n}_{1}}=2,{{n}_{2}}=3,4,5,...\]

    C)  \[{{n}_{1}}=3,{{n}_{2}}=4,5,6,...\]

    D)  \[{{n}_{1}}=4,{{n}_{2}}=5,6,7,...\]

    Correct Answer: C

    Solution :

                     Paschen series is the third series of hydrogen spectrum and lies in the infrared region, therefore   for  this   series,   \[{{n}_{1}}=3\]  and \[{{n}_{2}}>{{n}_{1}},ie,\,4,5,6,....\]


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