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What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?
halflife
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.
How does the length of the half-life of the element correspond to the radioactivity of the element?
The length of time required for half of a sample of radioactive material to decay
What is the fraction of a sample of tritium that remains undecayed after fifty years?
After 50 years, approximately 50% of tritium will remain undecayed in a sample. Tritium has a half-life of about 12.3 years, which means that the amount of undecayed tritium decreases by half every 12.3 years.
If half life of an unstable isotope is 10000 years and only 1 8 of radioactive parent remains in a sample how old is the sample?
30,000
What is the significance of a half life of a radioisotope?
It tells what fraction of a radioactive sample remains after a certain length of time.
What fraction of a radioactive sample remains after three half - life?
It is 1/8 .
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 percentage of a radioactive sample remains after 5 half-lives?
After 5 half-lives, 3.125% (or 1/2^5) of a radioactive sample remains. Each half-life reduces the sample by half, so after 5 half-lives, there is only a small fraction of the original sample remaining.
What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?
halflife
What fraction of a sample remains after three half lives?
An eighth remains.
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.
. If the half-life of an unstable isotope is 10000 years and only 18 of the radioactive parent remains in a sample how old is the sample?
30,000
What fraction of a sample of N 16 remains undecayed after 43.2 seconds?
1.5% remains after 43.2 seconds.
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.
