Question 1131793
This would be 2 half-lives or 3500 years
N=Ie^(1750k)
divide by I and N/I=1/4
1/2=e^(1750k)
ln of both sides
-ln2=1750k
k=-ln2/1750=-0.000396

N/I=0.25=e^(0.000396*t)
ln(0.25)=0.000396t
-ln4/-0.000396=t=3500.74 years, but 3500 is exact.