3. 
What is the approximate age, in years, of a sample that contains 90
% of its original C14? 

900
1950
3000
5000
27500 
4. 
What is the approximate age, in years, of a sample that contains 30
% of its original C14? 

4500
6200
7303
9700
15500 
5. 
What is the approximate age, in years, of a sample that contains 3
% of its original C14? 

850
1750
3000
5000
28000 
6. 
0.2% is the smallest activity that a sensitive detector can measure
from the emitted beta particles of C14 decay. Using this value, what
is the approximate maximum age in years that can be determined with
the C14 method? 

52,000
57,300
69,000
74,000
80,000 