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Carbon 14 has a half life of 5730 In a plant fossil you find that this has decayed to a quarter of the original amount How long ago was this plant alive?
Wiki User
∙ 12y ago
2 Half-Lifes= 1/4 Carbon 14 remaining. So 2 half lives have past. You add the 5730 years together to get 11460 years or 1.15*10^4 years.
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∙ 12y ago
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What is a half-life and how is it used to determine the absolute age of a rock?
Half-Life is the time it takes for one half of the amount of an element to decay. This process is inverse exponential, i.e. in one half-life there will be one half of the element left, in two there will be one quarter, in three there will be one eighth, and so on.If you know how much material was initially present, you can measure how much is present now, and you can calculate how long that took.Often, we use Carbon-14 dating, which compares the ratio of Carbon-14 to Carbon-12. When plants and animals are alive, they affix Carbon-14 into their celluar structures, causing a higher concentration as compared to regular rocks/soils in a regular way based on the amount of Carbon-14 in the general environment. Since we know the original ratio at the point of death, we can date the fossil.boobsThe half-life of carbon is 5730 years after that, half of the remaining carbon - 14 decays.they uses carbon14 to compare the age of rocks
Is air the same as carbon doixed?
Air is not the same as carbon dioxide but does contain a small amount of the gas. Air also contains oxygen and nitrogen.
What does the human process mainly contribute to?
decrease of the total amount of carbon found on earth
Carbon foot print?
Carbon footprint is a measure of the amount of carbon dioxide or CO2 emitted through the combustion of fossil fuels; in the case of an organization, business or enterprise, as part of their everyday operations; in the case of an individual or household, as part of their daily lives; or a product ...A carbon footprint is "the total set of GHG (greenhouse gas) emissions caused directly and indirectly by an individual, organization, event or product"its a gauge of how much energy you use so the more the worse the earths co2 layer gets
Would 2 kilometers be a good amount for a door?
Your question as stated makes little sense. Kilometers are units of distance- the "metric mile"- 2 km is about a mile and a quarter. So what does that mean in the context of a door and what does "amount" mean for doors?
Why is carbon-14 is a good way to date things?
Carbon 14 is a radioisotope which decays over time, measuring the amount of it will indicate how much has decayed and hence how old the object is.
What does carbon dating mean and how accurate is it?
Carbon dating is a method used to determine the age of organic materials by measuring the decay of carbon-14 isotopes. It is accurate within a range of about 50,000 years, with the most precise results obtained for samples less than 10,000 years old. Beyond that, the accuracy decreases due to the limited presence of carbon-14 isotopes in older samples.
Why cant carbon-14 be used to date material that is older than 75000 years?
Carbon has a half life of 5730 years. That means that after 5730 years there'll only be half the amount left. After about 11500 there will be a quarter of the original. After 75000 years there will be about 0.0001 of the original sample which is too small to date accurately?
Why will the amount of a radioactive substance never reach zero amount present?
The total amount of radioactive substance will never reach zero because it decays in half-lives. For C-14 is 5730 years, this means that after 5730 years one half of the original material will have decayed. After another 5730 years the remaining radioactive material (1/2 the original) will have decayed by 1/2 once again. -An infinite crowd of mathematicians enters a bar. The first one orders a pint, the second one a half pint, the third one a quarter pint... "I understand", says the bartender - and pours two pints.
How many days will it take an amount of tritium to fall to a quarter?
The half life of Tritium is 12.32 years. it would therefore take 24.64 years for the amount to fall to a quarter of the original.
Determine the amount of time it takes for three fourths of a radioactive sample of an isotope to decay?
The half-life is 4 days. That means half of it will be gone in 4 days, and that leaves half of the original sample. In another 4 days, half of the remaining half will have decayed. And that will leave only 1/4 th of the original sample. That means 3/4 ths of the original sample will have decayed. In 8 days, three fourths of a sample of a radioactive element with a half-life of 4 days will have decayed.
Which soil layer has the greatest amount of decayed material?
Top soil
What is the formula for carbon dating?
Carbon radiometric dating is based on measuring the amount of carbon-14 isotope in a sample of carbon of organic origin (from a living thing that is now dead). In a living thing the amount of carbon-14 in its carbon remains at equilibrium with its environment (~1.5 PPB) which remains roughly constant due to the production of carbon-14 by cosmic ray impacts with atoms in the upper atmosphere. This carbon-14 is continuously decaying by beta decay to nitrogen-14, but by interconnection with its environment the lost carbon-14 is replaced.Once the living thing dies however it is no longer interconnected to its environment and the decayed carbon-14 is no longer replaced. Carbon-14 decays with a halflife of 5730 years. By measuring the amount of carbon-14 in the sample and calculating how long on the exponential curve it took to drop from the equilibrium level it had when last alive to its current measured level, you get the age of the sample.The technique is not perfect:for a variety of reasons the carbon-14 level in the environment is not actually constant over time, this requires checking carbon dating ages against other dating methods ages in many casesmaterials older than about 40000 to 50000 years old are usually not datable with carbon dating as the level of carbon-14 in the sample has decayed to low to be reliably measured with any accuracyof course it will not work on samples that do not contain carbon or which are contaminated with either carbon of nonorganic origin or ancient organic carbon (carbon in which all the carbon-14 has already decayed)etc.
What layer of soil contains a large amount of decayed matter?
the top one
When using cornflour instead of plain do you use the same amount?
No but in certain cases yes but half of what was in the beginning of the original amount and plus a quarter of that should be added in certain cases because of the high amount of certainty.
What is the percentage of radioactive nuclei left after 3 half lives have passed?
12.5%
Why can't carbon 14 be used to date material that is older than 75000 years?
The half-life of carbon is roughly 6000 years. That means that every 6000 years, the amount of Carbon halves. Therefore, in a million years, the amount of carbon-14 would be so low that it would be extremely difficult to determine the exact age of the shell. So radioactive elements of longer half-lives, such as Uranium-238(half-life of 4.9 billion years) are used to date older objects.
