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What are th uses of c14?
Carbon-14 is used for radioactive dating. Since its half-life is about 5000 years, it can be used a) to date items that contain a reasonable amount of carbon (especially remains of living beings), and b) up to a limit of about 50,000 years.
What is the daughter product of the nuclear decay equation of C14?
N14
What is phenolphthalein made of?
Phenolphthalein is made up of, H20, C14, O4,
List a range of items that can be dated by isotope carbon 14?
It is not that simple. Carbon 14 (C14) is created in the upper atmosphere by the action of cosmic rays on Nitrogen atoms. There is not much of it, C14 occurs in trace amounts, only making up as much as 1 part per trillion (0.0000000001%) of the carbon on the Earth. This amount of C14 is in balance, the amount created in the upper atmosphere balances the amount lost by the natural radioactive decay of the isotope. All living things on earth, are made of chemicals that include carbon and, while living, the amount of C14 in them is in balance with the amount of C14 in the atmosphere. However when a living thing dies it no longer mixes the carbon in its body with that of the atmosphere and thus the amount of C14 it contains begins to reduce to levels below that found in the atmosphere because the C14 decays radioactively. Thus items to be dated using C14 must contain carbon (wood, charcoal, hair and bones are good) and must have remained undisturbed since the organisms death. Also C14 decays rather quickly and is therefore only good for dating items that are less than about 60,000 years old.
What isotope serves as the current standard for the atomic mass scale?
with C14 atom
The half-life of C14 is 5730 years. What fraction of the original C14 would you expect to be present in a fossil that is 28650 years old?
There would be 1/32 left.
What half-life of C14 is 5730 years. What fraction of the original C14 would you expect to be present in a fossil that is 28650 years old?
1/32 of the original amount.
What fraction of the original c14 would you expect to be present in a fossil that is twenty eight thousand six hundred and fifty years old?
The half-life of C14 is 5730 years so the given period is 5 half-lives. You should, therefore, expect approx 2-5 = 0.03125 of the original C14 to remain.
What is the half life of C14?
The half life of Carbon 14 used for radioactive decay id 5,700 years
The half-life of carbon-14 is 5730 years. How long will it take for the number of carbon-14 nuclei in a sample to drop to a quarter of the original number?
5370 years. A half-life is how long a radioactive object takes for half of all its atoms to become new elements. 100 is half of 200 =)
How old would the turtle be if it only had 6.25 percent of the carbon 14 that a living turtle had today?
The half life of carbon 14 is 5730 years. If the turtle has 6.25 the carbon 14 of a modern turtle, assuming that the ancient turtle had the same amount of C14 as the modern turtle when the ancient turtle died, the ancient turtle died at around 4 half lives of C14 ago. ln(.0625)/ln(.5)=4. So the turtle died approximately 22920 years ago Start with 100 percent of the C14. 100 Every time a half life passes, the amount of C14 is reduced by half. so 100*(1/2)^x x is the number of half lives that have passed. 100*(1/2)^4 = 6.25
How much c14 would be left after 10 half lives?
After 10 half lives, only ( \left(\frac{1}{2}\right)^{10} = \frac{1}{1024} ) or approximately 0.098% of the original amount of C14 would be left.
Could carbon 14 be used for dating rocks from the precambrian time?
NO. 1) Carbon is not a common component of rocks. 2) C14's half life is too short.
If a sample that originally contain 10 grams of C14 has gone through two half-lives of Decay how much C14 will be left?
2.5
A researcher who uses carbon dating on anciet items?
The half life of C14 is about 5700 years, so items that are a few multiples of this time are suitable for carbon14 dating. Most archaeological items are suitable, and some young fossils.
What is the c-14 c-12 ratio used to date once living organisms?
It is because living organisms absorb C14 from their environment. After death, they are no longer capable of absorbing any more C14. So, at the time of death, the C14 : C12 ratio is fixed. C14 undergoes radioactive decay (into C12) so the C14 : C12 ratio declines and that can be used as a measure of the time since death.
What type of dating involves the use of radioactive elements and half-lives?
Radioactive decay may be used in carbon dating, testing for the amounts of a radioactive carbon isotope (C14) in the remains of some organism. C14 obviously only works on organic material which was once alive, such as wood or bone. Because C14 has a very short half life, less than 6000 years, it does not work on material much over 60,000 years (about ten half lives). Potassium/Argon is another useful set of isotopes that can yield the ages of rocks and inorganic matter far older--many millions of years old.
