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NEET Chemistry NEET PYQ-Nuclear Chemistry

  • 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:                    [AIPMT 1999]

    A) 16.758 MeV

    B) 1.6758 MeV

    C)             0.16758 MeV

    D) 0.016758 MeV

    Correct Answer: C

    Solution :

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


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