Question

A layer of peat beneath the glacial sediments of the last ice age had a carbon-14 content of 25 % of that found in living organisms. How long ago was this ice age?

Answer 1

12,800 years ago
using ln[A]/[A]o = -0.693/half-life X t

Answer 2

The ice age is 11466.45years

Step-by-step explanation:

The half-life of carbon-14 is 5730 years

t(1/2)= 0.693/k

K= 0.693/t(1/2) = 0.693/5730

k = 1.209×10^-4/yr

Kt= Lnrate1/rate 0= Ln25/100 =-1.386

t= 0.693/kt = 1.3863/(1.209×10^-4)

t=1.14665×10^4years

t= 11466.45years = ice age.