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

  • question_answer
    Solid targets of different elements are bombarded by highly energetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as                                         [AIIMS 2005]

    A)            \[f\propto \sqrt{Z}\]        

    B)            \[f\propto {{Z}^{2}}\]

    C)            \[f\propto Z\]                      

    D)            \[f\propto {{Z}^{3/2}}\]

    Correct Answer: B

    Solution :

               \[\lambda \propto \frac{1}{{{Z}^{2}}}\Rightarrow \frac{c}{\nu }\propto \frac{1}{{{Z}^{2}}}\Rightarrow \nu \propto {{Z}^{2}}\]


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