Plutonium decays with half-life of ${\rm{24000 }}\,{\rm{yr}}$. If plutonium is stored for ${\rm{7200 }}\,{\rm{yr}}$, the fraction of it that remains is

JEE PHYSICS MCQ: NUCLEI

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Application +4 | -1

Plutonium decays with half-life of

\mathrm{24000 }\,\mathrm{yr}

. If plutonium is stored for

\mathrm{7200 }\,\mathrm{yr}

, the fraction of it that remains is

View answer and explanation

Correct option: A

\mathrm{1/8}

Option A (1/8) is correct because after 3 half-lives, the remaining fraction is (1/2)³.