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If a radioactive isotope had a half - life of 1 billion years how much of it would be left after 2 billion years?
Wiki User
∙ 15y ago
1/4: Half would be gone after a billion years and half of that would be gone in another billion years. 1/4: Half would be gone after a billion years and half of that would be gone in another billion years. 1/4: Half would be gone after a billion years and half of that would be gone in another billion years.
Wiki User
∙ 15y ago
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Were dinosaurs alive 500000000000000000 years ago?
No, the earth is only about 4 billions years old, which is 4,000,000,000. The universe is thought to be about 14 billion years old, which means it would not have existed either.
How long ago the earth was formed age in years?
it is 4.54 billion years...
What was the first organism evolved on earth around 4 billion years ago?
Single cell prokaryotes first appeared perhaps 3.8 billion years ago.
Did sun or earth is born first?
The solar nebula formed (~7 billion years ago)The solar nebula collapsed into the disk of the solar system (~6.5 billion years ago)The sun formed and ignited fusion at the center of the disk of the solar system (~6 billion years ago)The planets, asteroids, and comets formed from the outer parts of the disk of the solar system (~4.5 billion years ago)
Was Oxygen present in Earth's second atmosphere over 4.5 billion years ago?
The Carboniferous period, during which oxygen amounted to 35% of the atmosphere by volume (this was around 300 million years ago). Nowadays the amount is 20.95%.
Isotope A has half-life of seconds and isotope B has a half-life of millions of years which isotope is more radioactive?
Isotope A
What is the similarity of radioactive isotope and radioactive dating?
Radioactive isotopes are used for radioactive dating. For example, you would use radioactive isotope Carbon-14 to date anything under 70,000 years that was once living. Radioactive isotopes decay from their parent isotope to daughter isotope at a constant rate (under any circumstances). The rate at which a parent isotope decays to its daughter isotope is considered one half life. Carbon-14 has a half life of 5730 years and its daughter isotope is Nitrogen-14. In order to determine how old something is you have to find out how much of the parent isotope is present in relation to the daughter.
How are radioactive isotopes used to determine the absolute age of igneous rock.?
Answer : When the isotopes decay, scientists can find out how old the rock is depending on the radioactive isotope's half-life. Explanation: Radioactive isotopes are unstable and will decay. For example, when humans die carbon-14 decays. The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope. At the next half-life there will be 25% of the radioactive isotope and 75% of the stable isotope. At the next half life there will be 12.5% radioactive and 87.5% stable. Example: Carbon-14 is a radioactive isotope with a half life of 5,730 years. How old would carbon-14 be when there is 75% carbon-14 in the rock? 75% is half of the time before the half-life, so it would be 2,365 years. Hope this helps. Half life helps scientists find how much the isotope has decayed and the age of the rock.
How are radioactive isotopes used determine the absolute age of igneous rock?
Answer : When the isotopes decay, scientists can find out how old the rock is depending on the radioactive isotope's half-life. Explanation: Radioactive isotopes are unstable and will decay. For example, when humans die carbon-14 decays. The isotopes will decay into a stable isotope over time. Scientists can tell how old the rock was from looking at the radioactive isotope's half-life, which tells them how long it would take for there to be half the radioactive isotope and half the stable isotope. At the next half-life there will be 25% of the radioactive isotope and 75% of the stable isotope. At the next half life there will be 12.5% radioactive and 87.5% stable. Example: Carbon-14 is a radioactive isotope with a half life of 5,730 years. How old would carbon-14 be when there is 75% carbon-14 in the rock? 75% is half of the time before the half-life, so it would be 2,365 years. Hope this helps. Half life helps scientists find how much the isotope has decayed and the age of the rock.
Is ac radioactive?
Actinium is radioactive. The Ac-227 isotope has a half life of 21.77 years
Is U-238 a short lived radioactive isotope?
No, it has a half-life* of around 4.468 billion years *A Half-life is the time it takes for the amount of substance undergoing decay to half.
What is the appropriate radioactive isotope to use to estimate the age of a rock from a rock formation believed to be a billion years old?
Uranium isotopes could be used to date rock of this age if they are present in the rock.
What is the half- life of radioactive carbon?
Carbon-14 or 14C, which is a radioactive isotope of carbon, has a half life of 5,700 years.
How many years will it take for 10g of radioactive uranium to decay into 5g of radioactive uranium?
Depending on the isotope: - for 235U: 7,038.108 years - for 238U: 4,468.109 years etc.
Does plutonium have atleast one non radioactive isotope?
No, it does not. The longest lived isotope, plutonium-244, has a half life of 80,800,000 years.
How much cesium would remain from a 10g sample after 4 years?
I suppose that you think to the radioactive isotope Cs-17; After 4 years remain 9,122 g.
A radioactive element has a half-life of 2000 years. If a sample of this element begins with a mass of 100 grams how long would you have to wait for the mass to decrease to 25 grams?
You would have to wait 6,000 years for this to occur, because it requires twice the half-life to reduce the radioactive isotope to 1/4 of its original mass.
