${ } ^ { 14 } \mathrm { C }$ has a half life of 5730 years. How old is a piece of charcoal which has lost 90% of its ${ } ^ { 14 } \mathrm { C }$ ?
A) 20,000 years
B) 11,109 years
C) 9100 years
D) 19,109 years
E) none of these

Name: ${ } ^ { 14 } \mathrm { C }$ has a half life of 5730 years. How old is a piece of charcoal which has lost 90% of its ${ } ^ { 14 } \mathrm { C }$ ? A) 20,000 years B) 11,109 years C) 9100 years D) 19,109 years E) none of these
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The Answer is D

14C{ } ^ { 14 } \mathrm { C }14C

${ } ^ { 14 } \mathrm { C }$