JEE Main & Advanced Physics Atomic Physics Question Bank Atomic Structure

  • question_answer
    The frequency of 1st line of Balmer series in \[{{H}_{2}}\] atom is \[{{\nu }_{0}}\]. The frequency of line emitted by singly ionised He atom is  [CPMT 2002]

    A)            \[2{{\nu }_{0}}\]                 

    B)            \[4{{\nu }_{0}}\]

    C)            \[{{\nu }_{0}}/2\]               

    D)            \[{{\nu }_{0}}/4\]

    Correct Answer: B

    Solution :

               \[\nu \propto {{Z}^{2}}\Rightarrow \frac{{{\nu }_{{{H}_{2}}}}}{{{\nu }_{He}}}={{\left( \frac{1}{2} \right)}^{2}}=\frac{1}{4}\Rightarrow {{\nu }_{He}}=4{{\nu }_{{{H}_{2}}}}\]= 4n0


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