A) binary fission
B) nuclear fission
C) stable nuclei
D) decay of unstable nuclei
Correct Answer: D
Solution :
Rutherford and Soddy in 1902 put forward the disintegration theory of radioactivity. According to which radioactive elements, which are generally heavy elements) are unstable. The source of unstability is nucleus. They undergo spontaneous break down and this process is continuous until finally a stable and non radioactive nuclear species formed.
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