alleryRadioactivity is a decay undergone by a nucleus that is:
AUnmoving
BUnmixed
CUnstable
DUnusual
Answer & Solution
Correct answer: C. Unstable
1. Stable nuclei do not decay.
2. The process is called radioactive decay.
3. The nucleus is unstable.
_Source: syllabus Physics, Ch 13 'Nuclei'_
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