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NEET 2021
Exam
NEET
Year
2021
Subject
Physics
Chapter
Nuclear Physics

NEET 2021 · Physics · Nuclear Physics

A radioactive nucleus array ll A Z array X undergoes spontaneous...

A radioactive nucleus AZ\begin{array}{ll}A \\ Z\end{array}Xundergoesspontaneousdecayinthesequenceundergoes spontaneous decay in the sequenceAZ\begin{array}{ll}A \\ Z\end{array}X→X \to(Z−1)\begin{array}{ll}\left(Z - 1\right)\end{array}B→B \to(Z−3)\begin{array}{ll}\left(Z - 3\right)\end{array}C→C \to(Z−2)\begin{array}{ll}\left(Z - 2\right)\end{array}DD, where ZZ is the atomic number of element XX. The possible decay particles in the sequence are:

Options

  1. Aα,β−,β+\alpha, {\beta}^{-}, {\beta}^{+}
  2. Bα,β+,β−\alpha, {\beta}^{+}, {\beta}^{-}
  3. Cβ+,α,β−{\beta}^{+}, \alpha, {\beta}^{-}
  4. Dβ−,α,β+{\beta}^{-}, \alpha, {\beta}^{+}

Correct answer

C. β+,α,β−{\beta}^{+}, \alpha, {\beta}^{-}

Step-by-step solution

As we know due to α\alpha-decay atomic number decreases by 22 and mass no. decreases by 4.4 . And due to β−{\beta}^{-}decay mass no. remain unchanged and atomic no. increases by 11 And due to β+{\beta}^{+}decay mass no. remain unchanged but atomic no. decreases by 11.

So, option (3)( 3 ) is correct option.

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