Half-life of radioactive sample, when activity of material initially was ${\rm{8 }}\,{\rm{counts}}$ and after ${\rm{3}}\,\,{\rm{h}}$ it becomes ${\rm{1 }}\,{\rm{counts}}$, is

JEE PHYSICS MCQ: NUCLEI

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Half-life of radioactive sample, when activity of material initially was

\mathrm{8 }\,\mathrm{counts}

and after

\mathrm{3}\,\,\mathrm{h}

it becomes

\mathrm{1 }\,\mathrm{counts}

, is

View answer and explanation

Correct option: B

\mathrm{1}\,\,\mathrm{h}

Option B (

\mathrm{1}\\ h

) is correct because it is calculated by finding the number of half-lives that have elapsed and dividing the total time by that number.