Punjab Medical Punjab - MET Solved Paper-2009

  • question_answer
    The wavelength of\[{{K}_{a}}\]\[X-\]rays for lead isotopes \[P{{b}^{208}}\],\[P{{b}^{206}}\]and\[P{{b}^{204}}\]are\[{{\lambda }_{1}},\,\,{{\lambda }_{2}}\]and\[{{\lambda }_{3}}\]respectively. Then

    A) \[{{\lambda }_{1}}={{\lambda }_{2}}={{\lambda }_{3}}\]               

    B) \[{{\lambda }_{1}}>{{\lambda }_{2}}>{{\lambda }_{3}}\]

    C) \[{{\lambda }_{1}}<{{\lambda }_{2}}<{{\lambda }_{3}}\]               

    D) \[{{\lambda }_{1}}={{\lambda }_{2}}>{{\lambda }_{3}}\]

    Correct Answer: A

    Solution :

    The wavelength of \[X-\]rays depends on the atomic number\[Z\]. Since, isotopes are the elements which have same atomic number. So,          \[{{\lambda }_{1}}={{\lambda }_{2}}={{\lambda }_{3}}\]


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