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The half-life of 214Bi is 19.7 minutes. However, it has two decay modes, neither of which leads directly to lead; that complicates things. One of the decay modes leads to 214Po, which then quickly (half-life 0.0016 seconds) decays to 210Pb. The other one leads to 210Tl, which has a half-life of 1.3 minutes and also decays to 210Pb. So: Half of the 214Bi will be gone in 19.7 minutes; a bit after that half the sample will be 210Pb.
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What is the difference between the suns nuclear reactions and man made ones?
The sun's nuclear reactions are based on fusion of atoms (hydrogen atoms are fused together to form helium or lithium mainly) whereas earth-bound nuclear reactions are based on fission (uranium atoms are smashed apart to form (often radioactive) fragments and energy) There has been research on earth-bound nuclear fusion for many years (JET project in the UK) and ITER, but there is still a long way to go before we can mimic the sun!
What are limits of using uranium 238 in dating the age of objects?
The main limitation of using uranium 238 for dating objects is that it has a very long half-life (4.5 billion years), which makes it unsuitable for dating more recent objects. Additionally, there can be challenges in accurately measuring the ratios of uranium and its decay products in the sample, which can affect the reliability of the age determination.
How old is a 10-year-old on Mars?
A year on Mars lasts 687 Earth days. Do a little math - 365/687=53%.53% of 10 is 5.3 years old or 5 years 109.5 days old.Sort of ...If you want to use Mars years, you should also use Mars days for your final answer.10 Earth years = 5.316886 Mars years.The Mars solar day is 1.027491 Earth solar days.Converting to Mars solar days, 0.316886 Mars years would be 217.7 Earth-days (not 109.5 days) or 211.9 Mars-daysSo in Martian years and days, someone who is exactly 10 Earth Years old would be 5 Mars-years, 212 Mars-days old.(remember the .3 in the 5.3 "years" is Mars-years, not Earth years so you have to multiply it by 687 Earth-days, not 365 Earth-days)
What was the actual size of the earth at 1000000 years ago?
The actual size of the Earth at 1 million years ago would have been very similar to its current size. Over such a short timescale in geological terms, there would not have been any significant change in the Earth's size.
If a constant apparent speed of 1.54 km s by how many megaparsec would the separation between us and a galaxy change over the course of 2.0 billion years?
Assuming a constant speed of 1.54 km/s, the separation between us and the galaxy would change by approximately 2.3 megaparsecs over 2.0 billion years. This calculation is based on the formula Distance = Speed x Time, converting the distance from kilometers to megaparsecs.
If you start with 60 atoms of uranium - 238 how many remain after 4470000000 years?
After 4.47 billion years, roughly half of the original atoms of uranium-238 would have decayed to lead-206 through alpha decay. This means there would be about 30 atoms of uranium-238 remaining.
If the half-life of uranium 235 is 700 million years and have 64 atoms of it how many 700-million-year units of time will pass before 1 atom of uranium 235 is left?
It would take 1.4 billion years for half of the 64 atoms of uranium-235 to decay, leaving 32 atoms. Then another 700 million years would pass for half of the remaining 32 atoms to decay, leaving 16 atoms. This process continues until only 1 atom is left, which occurs after 5 half-lives or 3.5 billion years.
How long can radioactivity be on uranium?
Radioactivity can persist on uranium for billions of years, as uranium has a very long half-life. The most common isotope of uranium, uranium-238, has a half-life of about 4.5 billion years. Uranium-235, another isotope, has a shorter half-life of about 700 million years.
How many years will it take for 10 g of radioactive uranium to decay into 5 g of radioactive uranium?
It would take one half-life for the 10 g of uranium to decay into 5 g. The half-life of uranium is around 4.5 billion years, so it would take approximately 4.5 billion 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.
What is the half-life of uranium 238?
Alpha disintegration: (4,470 ± 0,020) 109 years Spontaneous fission: (8,20 ± 0,10) 1015 years
Is uranium sustainable?
Years after years uranium also will run out of the earth.
How many years would it take half of the rubidium-87 atoms in piece of rock to change into strontium-87?
The half-life of rubidium-87 is approximately 48.8 billion years. This means it would take about 48.8 billion years for half of the rubidium-87 atoms in a rock sample to decay into strontium-87. Therefore, to see half of the rubidium-87 atoms change into strontium-87, you would need to wait this extensive period.
If a sample is 10740 years old and has 400 atoms how many atoms are there after the organisms died?
After 10740 years, half of the sample would have decayed, so there would be 200 atoms left. If the original sample had 400 atoms, then there would be 200 atoms left in the sample after 10740 years.
What is the half-life of uranium 239?
Pu-239 has a half-life of 24,110 years.
How many atoms of calcium and potassium will there be after 4.12 and times 105 years?
The number of atoms of calcium and potassium after 4.12 × 10^5 years would remain the same, as these elements do not spontaneously change into other elements over such timescales. Assuming a stable environment and no external factors affecting the atoms, the number of calcium and potassium atoms would remain constant.
What atoms make up uranium?
Uranium is a very heavy (dense) metal said to have formed in supernovae about 6.6 billion years ago.It is a radioactive element found in many rocks in the Earth's crust.
