SOLUTION: A radioactive material has a half life of 3 hours. If after 8 hours there are 205g left, how many grams of material were there to begin with?
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Question 1146977: A radioactive material has a half life of 3 hours. If after 8 hours there are 205g left, how many grams of material were there to begin with?
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!
Working backward in time, the amount of material doubles every half-life.
8 hours is 8/3 half-lives.
The number of grams of material 8 hours ago was
205 * 2^(8/3)
Use a calculator....
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