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

  • question_answer
    An electron (charge =\[1.6\times {{10}^{-19}}C\]) is accelerated through a potential of 100,000 V. The energy acquired by the electron is                                                        [MP PET 1989]

    A)            \[1.6\times {{10}^{-24}}\ J\]  

    B)            \[1.6\times {{10}^{-14}}\ erg\]

    C)            \[0.53\times {{10}^{-17}}J\]  

    D)            \[1.6\times {{10}^{-14}}J\]

    Correct Answer: D

    Solution :

               \[E=eV=1.6\times {{10}^{-19}}\times {{10}^{5}}\]\[=1.6\times {{10}^{-14}}J\]


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