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The half life of carbon 14 is 5730 years If a 1g sample of old carbon is one eighth as radioactive as 1g of a current sample then the age is about?
Crissab
17,200 Years
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∙ 14y ago
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What does the half life of a radioisotope represent?
It tells what fraction of a radioactive sample remains after a certain length of time.
What happens to a radioactive material over time?
It disintegrates into its daughter nuclei that are much more stabler than the radioactive nuclei. If a sample of radioacictive material is left it will decay into another element over a period of time. Note that complete decay is not possible. A fraction of the original radioactive material will always remain in the sample.
Why After three half-lives what fraction of a radioactive sample remains?
The fraction that remains is 1/8.
What is the sample of the radioactive isotope 131I decays its half-life?
Iodine-131 has a half-life of about 8 days.
The time it takes for 50 percent of the nuclei in a radioactive sample to decay to its stable isotope is called?
the half-life
What must be true for radioactive dating to be possible with a certain sample?
The sample must contain radioactive elements.
What is the calculation of the age of an object by measuring the proportions of the radioactive isotopes or certain elements?
Carbon-14 dating is the measurement of an object's age by comparing the amount of carbon-14 to the amount of carbon-12 and carbon-13 present in the sample.
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 many years would it take for the mass of a 1.00 g sample of carbon12 to be reduce to 0.125g?
It will take practically forever. Carbon-12 is not radioactive.
Does a small sample of Carbon-14 have the same activity as a large sample of Carbon-14?
No and yes. It depends on the way you define activity. Carbon-14 undergoes radioactive beta decay. The activity of Carbon-14 is given in terms of disintegrations per minute per gram of carbon. So, if you have a 100 gram sample and a 1 gram sample, there will be 100 times more disintegrations per minute with the larger sample. But typically, we are more interested in the time it takes a certain percentage to decay. Time values like half life will be the same for large and small samples.
What does the half life of a radioisotope correspond to?
The length of time required for half of a sample of radioactive material to decay
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-lives?
Not sure what you mean by "had-lives". After 3 half lives, approx 1/8 would remain.
The original sample of a radioactive substance?
Yes, and the question is ... ?
Why is carbon 14 used to date ancient objects?
Carbon-14 is radioactive, with a half-life of 5730 years. Archaeologists use the amount of carbon-14 left in a organic sample to determine the age of the sample. This is known as radiocarbon dating.
The time it takes for half of the radioactive atoms in a sample of a radioactive element to decay is the element's?
i got no idea
What fraction of a sample remains after three half lives?
An eighth remains.
