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[" A freshly prepared sample of a radioi...

[" A freshly prepared sample of a radioisotope of "],[" half-life "1386" s has activity "10^(3)" distintegrations "],[" per second.Given that "ell n2=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."],[[" (1) "1%," (2) "2%],[" (3) "3%," (4) "4%]]

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