Questions:
1. How long does it take for half of the element to decay?
A. 22920years
C.11460years
B. 17190years
D.5730years
2How many percent of Carbon14 will be left after 11460 years?
A.12.5%
C.50%
B.25%
D.100%
3How much of the original material is left 17190 years?
A.12.5% C.50%
B.25%
D. 100%
4 How much of the origina Imaterial is left after 22920years?
C. lessthan 10%
C.25%
B.12%
D.50%
yearsold.
5This element would best be used to date fossils that are
D. abillion
C.lessthanamillion
E. afew million
D.afew thousand
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