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NEET Sample Paper NEET Sample Test Paper-77

  • question_answer
    The number of spectral lines that can be possible when electrons in 7th shell in different hydrogen atoms return to the second shell is

    A)  12                               

    B)  15                  

    C)  14                               

    D)  10

    Correct Answer: B

    Solution :

    Number of spectral lines \[=\,\,\,\frac{\left( {{n}_{2}}-{{n}_{1}} \right)\left( {{n}_{2}}-{{n}_{1}} +1 \right)}{2}\]            \[=\,\,\,\frac{(7-2)(7-2+1)}{2}\]\[=\,\,\,\frac{5\times 6}{2}=15\]


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