alleryHalf-life is the time taken for the decay of what fraction of the initial nuclei?
AOne fifth of them
BOne sixth of them
COne eighth of them
DOne half of them
Answer & Solution
Correct answer: D. One half of them
1. The name of the quantity states the fraction directly.
2. It is defined against the number present at the start.
3. Half-life is the time taken for the decay of one-half of the initial number of nuclei present.
4. So the answer is one half of them.
_Source: syllabus Physics Part II, Ch 13 'Nuclei'_
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