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What are the half lives for uranium-235 and uranium-238?
703, 800,000
If you were to have 80 grams of uranium how many grams would be present at the end of the second half time?
After the second half-life of uranium, half of the original amount will remain. Therefore, if you start with 80 grams of uranium, after one half-life you would have 40 grams remaining, and after the second half-life, you would have 20 grams.
Does nuclear fission take place in an uranium bar?
Yes, with a rather unimportant qualification. There are isotopes of uranium that do not undergo fission, but it is unlikely a bar would be made from any of them because they have short half lives and are expensive to produce.
After 6 half-lives What percentage of a radioactive sample remain?
After 6 half lives, the remaining will be (1/2)6 i.e 1/64 th of the initial amount. Hence by percentage it would be 1.5625 %
What is the age of a meteor with half being uranium 238 half being uranium 206?
There is no isotope of Uranium 206 - Uranium 217 is the lightest.
What are the half lives for uranium-235 and uranium-238?
703, 800,000
How come elements below uranium have equally short half-lives as the elements above uranium?
This affirmation is not correct; the half lives are different.
If you were to have 80 grams of uranium how many grams would be present at the end of the second half time?
After the second half-life of uranium, half of the original amount will remain. Therefore, if you start with 80 grams of uranium, after one half-life you would have 40 grams remaining, and after the second half-life, you would have 20 grams.
Uranium 238 decays to lead 206 how much of the oringinal uranium will remain after the third half life passes?
12.5 %
600 grams of uranium after 3 half lives how many grams would there be?
1 ounce and three large testes
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.
After three half-lives what fraction of a radioactive sample will remain?
Approx 1/8 will remain.
How much uranium is left if a solid piece for one half life?
Half life is the time taken for half the atoms to decay. Whatever mass you start with, if it is a sample consisting of one pure uranium isotope, you will have half that mass of uranium after one half life. The piece of metal will not weigh half of the original mass, because the decay products will be there. In practice, a piece of uranium usually consists of a mixture of isotopes with different half lives.
How many undecayed M and Ms would remain out of a sample of 600 M and Ms after three half lives?
75
Does nuclear fission take place in an uranium bar?
Yes, with a rather unimportant qualification. There are isotopes of uranium that do not undergo fission, but it is unlikely a bar would be made from any of them because they have short half lives and are expensive to produce.
After 6 half-lives What percentage of a radioactive sample remain?
After 6 half lives, the remaining will be (1/2)6 i.e 1/64 th of the initial amount. Hence by percentage it would be 1.5625 %
How much uranium is left if a solid piece exists for one half-life?
Half life is the time taken for half the atoms to decay. Whatever mass you start with, if it is a sample consisting of one pure uranium isotope, you will have half that mass of uranium after one half life. The piece of metal will not weigh half of the original mass, because the decay products will be there. In practice, a piece of uranium usually consists of a mixture of isotopes with different half lives.
