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

  • question_answer
    The ratio of specific charge of an \[\alpha \]-particle to that of a proton is                                             [BCECE 2003]

    A)            2 : 1                                          

    B)            1 : 1

    C)            1 : 2                                          

    D)            1 : 3

    Correct Answer: C

    Solution :

               Specific charge \[=\frac{q}{m}\]; Ratio \[=\frac{{{\left( \frac{q}{m} \right)}_{\alpha }}}{{{\left( \frac{q}{m} \right)}_{p}}}=\frac{{{q}_{\alpha }}}{{{q}_{p}}}\times \frac{{{m}_{p}}}{{{m}_{\alpha }}}=\frac{1}{2}\].


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