percentage of a radioactive sample that remains after four half-lives have passed is 6.25 %
As radioactive substances are first-order reactions and first-order reactions have a constant half-life and are represented by t1/2.
t1/2 = 0.693 / λ
half-life is the time period for the sample to become half of its original concentration
so for 1 st half-life, the substance will become 100 / 2 =50%
for 2 nd half-life, the substance will become 50 / 2 = 25%
for 3 rd half-life, the substance will become 25 / 2 = 12.5%
for 4 th half-life, the substance will become 12.5 / 2 = 6.25%
percentage of a radioactive sample that remains after four half-lives have passed is 6.25 %
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