Question

Carbon-14 has a half-life of 5,730 years. Suppose a fossil from a mammal contains one-fourth of its original amount of carbon-14. How old is the sample?


22,920 years
17,190 years
2,865 years
11,460 years

Answer 1

i think its 22920 years ?

Answer 2

no/n1=1/2t/1/2lif

Answer 3

what does that mean
..

Answer 4

5730 = ln2/k

k=1.2x10^-4

A=Aoe^(-kt)

25=100e^(-1.2x10^-4t)

ln(.25)=-1.2x10^-4t

t=-1.3862/-1.2x10^-4= 11552.45 years old

It's a bit off cuz i rounded

Answer 5

so it would be d