Q137 / 200 · NEET 2011 (Screening) · Physics

A nucleus ${ }_n^m X$ emits one $\alpha$-particle and two $\beta^{-}$particles. The resulting nucleus is

  • A
    ${ }_n^{m-6} Z$
  • Correct answer
    B
    ${ }_n^{m-4} X$
  • C
    ${ }_{n-2}^{m-4} Y$
  • D
    ${ }_{n-4}^{m-6} Z$

Solution

${ }_n^m X \stackrel{\alpha}{\rightarrow}{ }_{n-2} X^{m-4} \stackrel{2 \beta}{\rightarrow}{ }_n X^{m-4}$

Hence, the correct answer is option: 'B'.

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