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NEET Sample Paper NEET Sample Test Paper-72

  • 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

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

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

    C) \[f\propto Z\]                 

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

    Correct Answer: B

    Solution :

    Moseley?s law is an empirical law concerning the characteristic electromagnetic spectrum that is absorbed or emitted by atoms. Using X-ray diffraction techniques Moseley found that most intense short wavelength line in the X- ray spectrum of a particular element is related to the element?s atomic number Z as follows: \[f=(2.48\times 1{{0}^{15}}){{(Z-1)}^{2}}\,Hz\] \[\Rightarrow \,\,\,\,\,\,\,\,f\propto {{Z}^{2}}\]


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