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An eighth remains.

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Q: What fraction of a sample remains after three half lives?
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After three half-lives what fraction of a radioactive sample remains?

1/8 of the original amount remains.


Why After three half-lives what fraction of a radioactive sample remains?

After three half-lives, only 1/8 (or 12.5%) of the original radioactive sample remains. This is because each half-life reduces the amount of radioactive material by half, so after three half-lives, you would have (1/2) * (1/2) * (1/2) = 1/8 of the original sample remaining.


What fraction of a radioactive sample remains after three half - life?

It is 1/8 .


What fraction of a radioactive sample remains after three half-lives?

Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.


What fraction of a radioactive sample decays after three half lives?

If I take a radioactive sample of 400 moles of an unknown substance and let it decay to the point of three half-lives I would have 50 moles left of the sample. 1/2 of what is left will decay in the next half-life. At the end of that half-life I will have 25 moles left of the unknown substance or 4/25.


After three half-lives what fraction of a radioactive sample will remain?

Approx 1/8 will remain.


What fraction of a radioactive sample remains after three half lives?

Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.


Sample of the three models of a fraction?

There are three models of a fraction namely area model, liner model and set model.


Is a radioactive sample has decayed until only one eighth of the original sample remains unchanged how many half lives have elapsed?

Three half lives have elapsed. This can be determined by calculating how many times the original sample size must be halved to get to one eighth: (1/2) * (1/2) * (1/2) = 1/8.


How long will it take for three-fourths of a sample of caesium-137 to decay?

It will take two half-lives or about 60.34 years for three-fourths of a Cs-137 sample to decay.


After three half lives what fraction of the daughter product has formed?

91.16% of the daughter product has formed after 3.5 half lives.


How many half-lives have elapsed when the amount of a sample's Radioactive isotopes is reduced to 3.125 percent of the original amount in the sample?

Three half-lives have elapsed. This is because each half-life reduces the amount to half of its original value. So, after one half-life, the amount is reduced to 50%, then to 25% after two half-lives, and 12.5% after three half-lives, which is closest to 3.125%.