NEET Sample Paper NEET Sample Test Paper-14

  • question_answer \[{{K}_{\alpha }}\]wave length emitted by an atom of atomic number\[Z=11\]is \[\lambda .\]The atomic number for an atom that emits\[{{K}_{\alpha }}\]radiation with wavelength \[4\lambda ,\] is

    A)  6                    

    B)  4

    C)  11                  

    D)  44

    Correct Answer: A

    Solution :

    From Moseley's law, \[\sqrt{v}=a(z-1)\]for \[{{K}_{\alpha }}\,x-ray\]\[\frac{1}{\sqrt{\lambda }}\propto a(z-1)\Rightarrow \frac{1}{\sqrt{\lambda }}\propto a(11-1)\] and\[\frac{1}{\sqrt{4\lambda }}\propto a(z-1)\Rightarrow \frac{10}{z-1}=2\Rightarrow z=6.\] Hence, the correction option is .

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