Jee Advanced
Atoms And Nuclei
JEE Advanced 2013 Paper 1 Offline
INTEGER+3 / -02013
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 __________.