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J & K CET Engineering J and K - CET Engineering 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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