Testing shows that a sample of wood from an artifact contains 25% of the
original amount of carbon-14. given that the half-life of carbon-14 is 5730
years, how old is the artifact?
oa. 5730 years
ob. 22,920 years
oc. 17,190 years
od. 11,460 years

The artifact is 11,460 years old.

Explanation:

Given that,

The half life of the carbon-14 is 5730  years and we are left with 255 of the sample of wood from an arti-fact.

So it takes 5730 years for the sample to reduce into half

Initially there will be 100% of the sample so

after first 5730 years, the sample reduces into 50% percent

Now the left 50% sample will take another 5730 years to decay into half of its amount.

after next 5730 years  the sample reduces into 25% percent

So totally after 2 half-life the sample reduces into 25%

That is (5730 +5730) years = 11460 years