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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    Absorption of X-rays is maximum in which the following material sheets of sar thickness?

    A)  Cu                                         

    B)  Au

    C)  Be                                         

    D)  Pb

    Correct Answer: C

    Solution :

                    Intensity of emergence X-rays \[I={{I}_{0}}{{e}^{-\mu m}}\] \[\mu =\]absorption coefficient \[\mu \propto {{\lambda }^{3}}\] \[\mu \propto {{v}^{3}}\] and        \[\mu \propto {{z}^{3}}\] Absorption depends upon the atomic number. Be have maximum atomic number. So, absorption of X-rays is maximum for Be.


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