SOLUTION: the half life of radium is 1690 years if 40 grams are present now how much will be present in 250 years ?

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Question 925671: the half life of radium is 1690 years if 40 grams are present now how much will be present in 250 years ?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Q[t)= +Q%5Bo%5De%5E%28-kt%29
ln(.5)/-1690 = k = .00041
Q(t]= +Q%5Bo%5De%5E%28-.0041t%29
.......
Q(250)= 40e%5E%28-.0041%2A250%29 = 36.0883gm