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Problem
Problem
Half-life of a radioactive substance is
T
T
T
. At time
t
1
t_1
t
1
activity of a radioactive substance is
R
1
R_1
R
1
and at time
t
2
t_2
t
2
it is
R
2
R_2
R
2
. Find the number of nuclei decayed in this interval of time.
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