How to figure out half-lives
Half-live of Indium-116 is 14 seconds. How long will it take for 32 grams of this istotopw to decay to 1.0 grams. I know the answer is 70seconds but do not know how to get it!
2 answers
Every 14 seconds, the isotope's mass is halved.
You can iterate as TutorCat suggests, or you can follow this formula
k = 0.693/t1/2
Solve for k and substitute it into the equation below.
ln(No/N) = kt
No = 32
N = 1
k from above.
solve for t.
k = 0.693/t1/2
Solve for k and substitute it into the equation below.
ln(No/N) = kt
No = 32
N = 1
k from above.
solve for t.