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Physics
Physics
Problem
The activity of a radioactive sample falls to
20
%
20\%
20%
of its initial value in
15
days
15\,\text{days}
15
days
. Estimate its half-life (in days). a)
7.5
7.5
7.5
b)
15
15
15
c)
6.5
6.5
6.5
d)
3.3
3.3
3.3
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