Asked by Jason
If a 40 gram sample of radioactive isotope was present at 4pm, but a 5 gram sample remained at 4:30 pm, what is the half-life in minutes?
Answers
Answered by
DrBob222
ln(No/N) = kt
No = 40g
N = 5
k = ?
t = 90 min
Solve for k
Then k = 0.693/t<sub>1/2</sub>
Solve for half life in minutes.
Another way to do it is
(40/2*x) = 5
solve for x
Then 90 minutes/x = time for 1 half life.
You should get the same answer both ways.
No = 40g
N = 5
k = ?
t = 90 min
Solve for k
Then k = 0.693/t<sub>1/2</sub>
Solve for half life in minutes.
Another way to do it is
(40/2*x) = 5
solve for x
Then 90 minutes/x = time for 1 half life.
You should get the same answer both ways.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.