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Mathematics
Problem
A radioactive substance decays according to
y
(
t
)
=
C
e
k
t
y(t)=Ce^{kt}
y
(
t
)
=
C
e
k
t
with decay constant
k
=
−
0.042
yr
−
1
k=-0.042\,\text{yr}^{-1}
k
=
−
0.042
yr
−
1
. Determine its half-life, to the nearest whole year.
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