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J & K CET Medical J & K - CET Medical Solved Paper-2010

  • question_answer
    What is the maximum number of emission lines obtained when the excited electron of a hydrogen atom in\[n=5\]drops to the ground state?

    A)  10                                         

    B)  5

    C)  12                                         

    D)  15

    Correct Answer: A

    Solution :

                    Number of spectral lines obtained when an electron drops from nth level to ground level \[=\frac{n(n-1)}{2}\] \[\therefore \]Number of emission lines obtained, when electron drops from 5th level to ground state                 \[=\frac{5(5-1)}{2}\]                 \[=\frac{5\times 4}{2}=10\]


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