Question

Carbon-14 has a half-life of 5720 years and this is a first order reaction. If a piece of wood has converted 75% of the carbon-14, how old is it?
A. 11440 years
B. 2345 years
C. 4750 years
D. 4290 years
E. 1430 years

Answer 1

The answer will be the first option, i.e. 11440 years since the piece of wood has undergone two half lives