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Radioactivity
Law of radioactive decay
number of nucleus which do not melt for time t
N =
number of nucleus in initial time point
N
0
=
time
t =
s
x
ps
ns
μs
ms
s
min
h
d
y
half-life period
T
1/2
=
s
x
ps
ns
μs
ms
s
min
h
d
y
1. Define values of all variables, besides sought quantity
2. Change units if necessary
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