A stands for concentration.
this is my solution:
k = 0.693 / t
= 0.693 / (5730x365x24x60)
= 2.301 x 10 ^ -10
[A] = [Ao]exp(-kt)
15.3 = 7 exp(-2.301 x 10 ^-10 t)
t = 6465.5 years
is it correct?
Homework Statement
half life of carbon 14 is 5730 years. living matter produces 15.3 disintegrations per min per gram of carbon it contains. A 1g sample of a plant from an excavation shows 7 disintegrations per min from carbon-14. how long did the plant die?
Homework Equations
k = 1/ t...