SOLUTION: Cesium 13 is a radioactive element with a half life of 30 years. Predict how much of a 60mg sample of cesium137 would remain after 210 years. I am trying to figure out the formula

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Question 100911: Cesium 13 is a radioactive element with a half life of 30 years. Predict how much of a 60mg sample of cesium137 would remain after 210 years. I am trying to figure out the formula to solve this Thanks
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
210 years is 210/30 or 7 half-lives ... x=60((1/2)^7) ... x=0.46875mg

if A is the original amount, r is the amount remaining, t is the time , and h is the half-life ... r=A((1/2)^(t/h))