A) \[\alpha ,\beta ,\gamma \]
B) \[\beta ,\alpha ,\gamma \]
C) \[\gamma ,\alpha ,\beta \]
D) \[\beta ,\gamma ,\alpha \]
Correct Answer: B
Solution :
\[_{z}{{P}^{A}}{{\xrightarrow[{}]{\beta }}_{z+1}}{{Q}^{A}}{{\xrightarrow[{}]{\alpha }}_{z-1}}{{R}^{A-4}}{{\xrightarrow[{}]{\gamma }}_{z-1}}{{S}^{A-4}}\] (i) Emission of an\[\alpha -\]particle decreases the mass number by 2 units while atomic number by 4 units. (ii) Emission of an\[\beta -\]particle increases the atomic number by 1 unit while mass number remains as such. (iii) Emission of an\[\gamma -\]particle leads no change in mass number as well as in atomic number. Hence, the radiation emitted in sequence are \[\beta ,\alpha \]and\[\gamma \].
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