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MGIMS WARDHA MGIMS WARDHA Solved Paper-2003

  • question_answer
    How many neutrons are there in nucleus 'X', if it gives\[_{7}{{N}^{14}}\]after two successive \[\beta -\]particle emissions?

    A)  7                            

    B)  10

    C)  14                                         

    D)  9

    Correct Answer: D

    Solution :

                     The atomic number of radioactive element increases by one by the emission of 1 \[\beta -\]particle. Hence, after the emission of\[2\beta -\]particles, there will be an increase of 2 units in atomic number. Hence, \[_{5}{{X}^{14}}{{\xrightarrow[{}]{-2\beta \,particle}}_{7}}{{N}^{14}}\] Hence, the number of neutrons in parent element\[(X)=14-5=9\]


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