Asked by The orange baboon
A radioactive substance has a half-life of 3 minutes. After 9 minutes, the count rate was observed to be 200. What was the count rate at zero time?
Answers
Answered by
DrBob222
You can do it manually by increasing it by two for 3 times since you've gone through 3 half lives. Or you can follow the formula.
k = 0.693/t<sub>1/2</sub>
Then ln(No/N) = kt
No = ?
N = 200
k from above
t = 9 min
Solve for No. Post your work if you get stuck.
k = 0.693/t<sub>1/2</sub>
Then ln(No/N) = kt
No = ?
N = 200
k from above
t = 9 min
Solve for No. Post your work if you get stuck.
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