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EAMCET Medical EAMCET Medical Solved Paper-2010

  • question_answer
    An electron moving at a speed of \[5\times {{10}^{6}}m{{s}^{-1}}\] is shot through a sheet of paper which is \[2.1\times {{10}^{-4}}cm\]thick. The electron emerges from the paper with speed of \[2\times {{10}^{6}}m{{s}^{-1}}.\] The rime taken by the electron in a second to pass through the paper sheet is

    A)                 \[5\times {{10}^{-12}}\]                               

    B)                  \[6\times {{10}^{-13}}\]

    C)                 \[3\times {{10}^{-12}}\]                               

    D)                  \[5\times {{10}^{-13}}\]

    Correct Answer: B

    Solution :

                     (i) The collision is said to be elastic when the kinetic energy is conserved.                 (ii) Linear momentum is conserved in all types of collision                 (iii) Angular momentum of a system remain constant if resultant torque acting on it is equal to zero.                 As      \[L=I\omega ,\]so if \[\vec{\tau }=0\]then                 \[I\omega =cons\tan t\]                  (iv) In all physical process the total energy is conserved.                 So, option  is correct.


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