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Atoms and Nuclei question

2013 · Shift 1 · Q60
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Atoms and Nuclei question

2013 · Shift 1 · Q60

JEE AdvancedPhysicsAtoms and NucleiNumerical+3 / −1
A freshly prepared sample of a radioisotope of half-life 1386 s has activity 103 disintegrations per second. Given that ln2 = 0.693, the fraction of the initial number of nuclei (expressed in nearest integer percentage) that will decay in the first 80 s after preparation of the sample is ‾\underline{\hspace{2cm}}​.
Numerical answer
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