1.

When \[_{90}T{{h}^{228}}\] transforms to \[_{83}B{{i}^{212}}\], then the number of the emitted a- and b-particles is, respectively [MP PET 2002]

A. \[8\,\alpha ,\,7\beta \]
B. \[4\,\alpha ,\,7\beta \]
C. \[4\,\alpha ,\,4\beta \]
D. \[4\,\alpha ,\,1\beta \]
Answer» E.


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