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NEET Sample Paper NEET Sample Test Paper-52

  • question_answer
    How many lines in the spectrum will be observed when electrons return from 7th shell to 2nd shell?

    A) 13                                

    B) 14

    C) 15                                

    D) 16

    Correct Answer: C

    Solution :

    No. of spectral lines observed. \[=\sum \left( {{n}_{2}}-{{n}_{1}} \right)\] \[=\sum \left( 7-2 \right)=\sum 5=5+4+3+2+1=15\]


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