Half life time ln 2 ln beginning amount ending amount half life 11 69315 ln 32604 126 half life 15870 ln 25876. N of 5730 is equal to the amount we start off with. A certain radioactive substance has a half-life of 12 days.
A certain radioactive substance has a half-life of 12 days.
Represents the half-life of the decaying quantity t is a positive number and is the mean lifetime of the decaying quantity l is a positive number and is certainly the decay constant of the decaying quantity. So this tells us that after one half-life-- so t is equal to 5730. Starting with 145 grams of a radioactive isotope how much will be left after 3 half-lives. The half-life of a drug is an estimate of the period of time that it takes for the concentration or amount in the body of that drug to be reduced by exactly one half 50.