Topic: A Radioactive Sample Will Decay Completely in Two Half lives
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What fraction of a radioactive sample has decayed after two half-...
Hi, Each half-life means the mass of the sample has decreased by 1/2 its mass. Thus; After 1 half-life, 1/2 the sample has decayed. After 2 half-lives 3/4 of the sample has decayed. Hope this helps. Read More »
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If a radioactive sample has decayed until only 1/8 of the origina...
ChaCha... Read More »
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How many half-lives must elapse until 80% of a radioactive sample...
It helps to know that the decay constant which you have written as A but is normally a greek letter lambda is related to half-life th: th = ln(2) / A so th = 0.6931 / A Nt = 0.2 N0 = 1.0 th = 1 because you are expressing the result in units... Read More »
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A Radioactive Sample Will Decay Completely in Two Half lives
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400/2 = 200 200/2 = 100 100/2 = 50 50/2 = 25 25/2 = 12.5 How many times was the value halved? 5 half lives.
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