Half-life of a radioactive substance is $20\,\,minutes$. Difference between points of time when it is ${\rm{33}}\,\,{\rm{\% }}$ disintegrated and ${\rm{67}}\,\,{\rm{\% }}$ disintegrated is approximately

JEE PHYSICS MCQ: NUCLEI

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Half-life of a radioactive substance is

20\,\,minutes

. Difference between points of time when it is

\mathrm{33}\,\,\mathrm{\% }

disintegrated and

\mathrm{67}\,\,\mathrm{\% }

disintegrated is approximately

View answer and explanation

Correct option: B

20\,\,\min

Option B (

20\,\,\min

) is correct because it is the approximate difference in time between 33% and 67% disintegration, calculated using the half-life formula.