JEE Main & Advanced Physics Photo Electric Effect, X- Rays & Matter Waves Question Bank X Rays

  • question_answer
    Mosley's law relates the frequencies of line X-rays with the following characteristics of the target element [CPMT 1980; NCERT 1985]

    A)            Its density                             

    B)            Its atomic weight

    C)            Its atomic number             

    D)            Interplaner spacing of the atomic planes

    Correct Answer: C

    Solution :

                       \[\nu \propto {{(Z-b)}^{2}}\,\Rightarrow \,\nu =a\,{{(Z-b)}^{2}}\]            Z = atomic number of element (a, b are constant).


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