A radioactive substance has an average life of ${\rm{5}}\,{\rm{h}}$. In a time of ${\rm{5}}\,{\rm{hours}}$

Less than half of the active nuclei decay

JEE PHYSICS MCQ: NUCLEI

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A radioactive substance has an average life of

\mathrm{5}\,\mathrm{h}

. In a time of

\mathrm{5}\,\mathrm{hours}

View answer and explanation

Correct option: C

More than half of the active nuclei decay

Option C is correct because after one average life, approximately 63% of the radioactive nuclei decay, which is more than half.