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NEET Sample Paper NEET Sample Test Paper-56

  • question_answer
    Hydrogen atom in ground state is excited by a monochromatic radiation of\[~\lambda = 975 \overset{\operatorname{o}}{\mathop{A}}\,\]. Number of spectral lines in the resulting spectrum emitted will be:

    A) 3                     

    B) 2         

    C) 6                     

    D) 10

    Correct Answer: C

    Solution :

    [c] \[{{E}_{1}}=\frac{12400}{975}=12.69eV\] Number of spectral \[lines=\frac{n\,(n-1)}{2}\] \[\Delta \,E=13.60-12.69\] \[\Delta \,E=0.90eV\] \[{{n}^{2}}=\frac{13.6}{\Delta E}=\frac{13.6}{0.9}\] \[{{n}^{2}}=15.8\sim 16\] \[n=4\] Number of spectral line \[=\frac{4\,(4-1)}{2}=6\]


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