Question

can anyone help me with exponential decay?

Answer 1

Post the question :D

Answer 2

Situation:
An archaelogist in Turkey discovers a spear head that contains 27% of it's original amount of c-14.
k = .0001
find the age of the spear head and round to the nearest year.

Answer 3

Exponential decay: \[f(t) = A*e^{-kt}\]
f(t)/A = .23
Therefore: ln(.23) = -kt
t = ln(.23)/(-.0001) = 14969.7597 years = 14970 years