1.

A nucleus `._(90)^(229)X` under goes `alpha`-decay and `beta`-decay and the resultant nucleus is `._(73)^(181)Y`. Find number of `beta`-decay.

Answer» `._(90)^(229)Xto._(73)^(181)Y+a ._(2)^(4) alpha+b ._("-1")^(0) beta`
a=12
b=7


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