1.

The isotope \[_{92}{{U}^{235}}\] decays in a number of steps to an isotope of lead \[_{82}P{{b}^{207}}\]. The groups of particles emitted in this process will be                                  [MP PMT 1987]

A.                 \[4\alpha ,\,7\beta \]    
B.                 \[6\alpha ,\,4\beta \]
C.                 \[7\alpha ,\,4\beta \]    
D.                 \[10\alpha ,\,8\beta \]
Answer» D.                 \[10\alpha ,\,8\beta \]


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