CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2009

  • question_answer
    \[\beta \]-decay means emission of electron from

    A)  innermost electron orbit

    B)  a stable nucleus

    C)  outermost electron orbit

    D)  radioactive nucleus

    Correct Answer: D

    Solution :

    (3-emission takes place from a radioactive nucleus as                 \[_{15}^{32}P\xrightarrow{-\beta }\,_{16}^{32}P{{+}_{-1}}{{e}^{0}}+\overline{v}\]where \[\overline{v}\] is the anti-neutrino. In P+ decay a positron is emitted as                 \[_{11}^{22}Na\xrightarrow{{}}\,_{10}^{22}Ne{{+}_{+1}}{{e}^{0}}+v\]where v is the neutrino.


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