Chemistry
A piece of wood found in an ancient city has a carbon14 to carbon12 ratio that is oneeighth the carbon14 to carbon12 ratio of a tree growing nearby. How old is the piece of wood? (The halflife of carbon14 is 5,715 years.)
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John

k = 0.693/t_{1/2}
Substitute k into the below equation.
ln(No/N) = kt
Use 100 for No
Use 12.5 for N (that's 1/8 of 100or you could simply use 1/8 for that ratio).
k from above.
Solve for t in years.posted by DrBob222

2865 years
posted by Josh
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