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NEET Sample Paper NEET Sample Test Paper-70

  • question_answer
    Highly energetic electrons are bombarded on a target of an element containing 30 neutrons. The ratio of radii of nucleus to that of helium nucleus is\[{{14}^{1/3}}\]. The atomic number of nucleus will be

    A) 25                               

    B) 26

    C) 56                               

    D) 30

    Correct Answer: B

    Solution :

    By using \[\operatorname{R}={{R}_{0}}{{A}^{1}}{{^{/}}^{3}}\,\,\,\Rightarrow \,~\,\,\,\frac{{{R}_{1}}}{{{R}_{2}}}={{\left( \frac{{{A}_{1}}}{{{A}_{2}}} \right)}^{1/3}}\] \[\Rightarrow \,\,\,A=\,\,56\,\,so\,\,Z=56-30\,\,=\,\,26.\]


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