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A radioactive sample has a half life of 5.0 mins. what fraction of the sample is left after 20 mins. |
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Answer» Answer: The GENERAL formula for this PROBLEM is: %left = (1/2)^(TIME PAST / half-life) In this case, %left = (1/2)^(20/5) = 0.5^4 = 0.0625 = 1/16 Consider 18 minutes: %left = (1/2)^(18/5) = 0.5^3.6 = 0.0825 Explanation: |
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