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NEET AIPMT SOLVED PAPER 1999

  • question_answer
                    Sulphur = 35 (34.96903 amu) emits a \[\beta \]-particle but no \[\gamma \]-ray. The product is chlorine = 35 (34.96885 amu). The maximum energy emitted by the alpha-particle is:                                                                

    A)              16.758 MeV  

    B)              1.6758 MeV          

    C)              0.16758 MeV

    D)              0.016758 MeV

    Correct Answer: C

    Solution :

                    \[\underset{(Mass=34.96903\,amu)}{\mathop{_{16}{{S}^{35}}}}\,\xrightarrow[{}]{-\beta }\,\,\underset{(Mass=34.96885)}{\mathop{_{17}{{C}^{35}}}}\,\]                 Mass defect = (34.96903 ? 34.96885) amu                 = 0.00018 amu             Energy = 0.00018 \[\times \] 931 MeV = 0.16758 MeV


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