Question

Answer check

Answer 1

Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution.
25=100 e^(-.693 t/45.1)

Ln(25)=ln(100) -.693 t/45.1
ln(25)-ln(100)=-.693 t/45.1
ln(25/100)=-.693t/45.1

t= - 45.1/.693 ( ln .25)

t=90.2 days.

Answer 2

@Luigi0210 @dan815 @nincompoop @aaronq

Answer 3

@Miracrown @zepdrix @mathmate

Answer 4

it's good \(\checkmark\)

Answer 5

Is there anything else I need to do? @aaronq

Answer 6

nope

Answer 7

Yey. Awesome. Thank you!

Answer 8

no probs, good job!