0
Uranium-235 has a half-life of 700 million year. how long does it take a 100 gram sample of uranium to decay to a mass of 50 grams?
Wiki User
∙ 7y ago
If a radioactive isotope has a half-life of 4 years, than 0.125 (0.53) of the isotope will remain after 12 years, or 3 half-lives.
The question asked about Uranium. There is no isotope of Uranium with a half-life of 4 years. The closest is 232U92, which has a half-life of 68.9 years.
Reference: http://www.nndc.bnl.gov/chart/
Wiki User
∙ 14y ago
Wiki User
∙ 7y agoThe half life is the time it takes for Uranium 235 to decay. That means that about half the uranium will decay into something else. It won't just disappear. The U235 will decay into another element which will decay to another element which will eventually become something stable like lead.
Lead does weigh less than U235 but a lot more than half the weight of U235 so 5 grams of U235 will never become 2.5 grams of something else.
Wiki User
∙ 7y agoThis time is 351 900 000 years.
The exact value of the half-life is 703,8 millions years.
Wiki User
∙ 7y agoOne half-life, since 50 grams is exactly one-half of 100 grams.
Wiki User
∙ 7y agoSince 50 g is 1/2 of 100 g, it will take 1 half life for this to occur. Thus, it will take 700 million years.
Wiki User
∙ 15y agoIt is impossible
Wiki User
∙ 7y ago700/2 = 350 million years
Add your answer:
Earn +20 pts
Does uranium 238 have the shortest half life?
The half life of 238U is 4,468.109 years; this is a very long halflife !
What would happen if you shot a uranium bullet at a sample of plutonium?
If the sample of plutonium was the correct isotope and near it's critical mass (300g IIRC) then it would gain sufficient mass to go super critical and undergo fission. This is the principal with which the first ever nuclear weapons were detonated. However if you're firing at a smaller sample it's unlikely there would be anything other than a chemical reaction with the uranium igniting and forming uranium oxide.
Is depleted uranium radioactive?
Yes, depleted uranium is radioactive, but it is not as radioactive as naturally occurring uranium as it is refined after mining the ore. Depleted uranium is uranium that is "left over" after some of the U-235 isotope has been removed in a process called enrichment. You'll recall that the U-235 is sought after as a fuel in nuclear reactors and as the energy source in nuclear weapons. We might see a quote that depleted uranium is only about 60% as radioactive as natural uranium. Depleted uranium is used in military vehicle armor and in armor-piercing projectiles. The use of this type of projectile can create dust that can be inhaled or enter the water or food supply. Uranium presents a hazard as a heavy metal poison as well as a radiation hazard, and debate continues over the use and long term effects of expenditure of these rounds. A link can be found below for more information to assist you in continuing research.
How long will it take half of a radioactive sample to decay?
The length of time depends on the element and isotope, but the point at which half of the sample has decayed is known as the half-life.
How many milligrams of a 15.0 mg sample of radium-226 remain after 6396 years if the half-life of radium-226 is 1599?
One sixteenth of a gram. 1st halflife- 1/2 gram 2nd, 1/4 3rd 1/8th 4th halflife, 1/16th
A uranium235 sample starts with 200 atoms and 700 million years later there are 100 atoms What is the halflife of uranium235?
700 milliion years. The definition of half-life is the period of time during which one-half of the atoms of an element undergo decay into other elements.
Uranium-235 has a half life of?
The half-life is 700 million years !
Does uranium 238 have the shortest half life?
The half life of 238U is 4,468.109 years; this is a very long halflife !
Uranium-235 has a half-life of 700 million years. how long does it take a 100-gram sample of uranium-235 to decay to a mass of 50 grams?
700 million (more exactly 703,8.106) years
What is better for dating a sample about 1 million years old uranium-235 or thorium-232?
Thorium-232.
How long does it take a 100 gram sample of uranium 235 to decay to a mass of 50 gram?
700 million years
To perform Uranium-235 dating on a sample what must be true?
The sample must contain Uranium-235.
How long does it take a 5 gram sample of Uranium -235 to decay to a mass of 2.5 grams?
700 million years
What is the time needed for half of a sample of a radioactive isotope to break down to form daughter isotopes called?
halflife
How much Pu 239 is typically found a uranium sample?
A pure and fresh prepared uranium sample don't contain plutonium; only the irradiated (in a nuclear reactor) uranium contain plutonium.
Would you use uranium 235 or thorium 232 to date a sample that was about million years old?
Uranium dating is recommended. Thorium dating (but with the isotope 230Th, not with the isotope 232Th) is recommended to minerals old of up to 500 000 years.
Why is a sample of uranium compound found to be losing mass gradually?
The cause is the radioactive decay of uranium isotopes.
