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NEET Sample Paper NEET Sample Test Paper-12

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

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

    B) \[4{{v}_{0}}\]

    C) \[{{v}_{0}}/2\]             

    D) \[{{v}_{0}}/4\]

    Correct Answer: B

    Solution :

     \[v\propto {{Z}^{2}}\Rightarrow \frac{{{v}_{{{H}_{2}}}}}{{{v}_{He}}}={{\left( \frac{1}{2} \right)}^{2}}=\frac{1}{4}\] \[\Rightarrow \]\[{{v}_{He}}=4{{v}_{{{H}_{2}}}}=4{{v}_{0}}\]


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