A wooden artifact from an ancient tomb contains 30 percent of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years.)
Your answer is ? years.

Question

A wooden artifact from an ancient tomb contains 30 percent of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years.) 
Your answer is   ?   years.

anonymous · Answer

9956 years

anonymous · Answer

let us assume that no of half life = n
and
we know
% remaining = (100/2^n)
solving this we get n= 1.7375
now multiplying this no. by 5730 we get 9956 years