NEET Sample Paper NEET Sample Test Paper-1

  • question_answer        What is the ratio of specific charge elm of an a-particles and that of electron (Proton is 1840 times heavier than an electron)?

    A)  \[\frac{1}{3680}\]                 

    B)  \[\frac{1}{4680}\]

    C)  \[\frac{1}{5680}\]                 

    D)  none of these

    Correct Answer: A

    Solution :

    Ratio,    \[R=\frac{\left( \frac{e}{m} \right)\alpha }{\left( \frac{e}{m} \right)electron}=\frac{\frac{2e}{4{{m}_{p}}}}{\frac{e}{{{m}_{e}}}}\] Where \[m & p\] is mass of proton and \[{{m}_{e}}\] is mass of electron. \[\therefore \]  \[R=\frac{{{m}_{e}}}{2{{m}_{p}}}\]                  \[=\frac{{{m}_{e}}}{2\times 1840{{m}_{e}}}\]   \[[\because {{m}_{p}}=1840\,{{m}_{e}}]\]                 \[=\frac{1}{3680}\]


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