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Carbon-14 has a half-life of 5730 years. how long does it take a 200-gram sample of carbon-14 decay to a mass of 100 grams?
5,730 years
How long does it take for coke to melt?
acid
How does knowing the half life of an isotope help a geologist establish the age of a rock or fossil?
In general, the shorter the half-life of a radioisotope, the less far back in time it will be useful in dating things from the past. Radioisotopes with short half-lives decay away more quickly, and if "too much" time has passed, there isn't a sufficient amount of the radioisotope left to "count" it with sufficient accuracy to date something. Radiocarbon dating is a fairly well known method of dating living thing back a few tens of thousands of years. It looks at ("counts") the carbon-14 decay in a sample and determines how long ago the living material died. When we are alive, our bodies are built of materials that include carbon. And carbon as it occurs has a bit of the C-14 isotope in it. That means there will be a give "concentration" of C-14 in all our tissues. When we die, C-14 intake stops, and the C-14 in our tissues decays without being replaced. We know how long it takes for C-14 to decay (we know its half-life), and we can measure what is left and make a fairly accurate estimate of how long the material has been dead. After a while, there just isn't enough C-14 left to make for accurate dating. Anyone who says living material has been C-14 dated to 100,000 years is pulling your leg. If we were dating rocks, we could use uranium-lead or lead-lead dating. They take as way back in time. But these methods have limits on their applications, just like carbon dating. There are always limits on what we can do as regards radiometric dating, and one of them depends on which radioisotope we choose to illuminate the past.
What two sources take CO2 out of the atmosphere?
The ocean removes carbon dioxide (CO2) from the atmosphere as part of the carbon cycle. This carbon recycles round and returns to the atmosphere again.Trees, forests and all growing vegetation remove CO2 from the atmosphere, release the oxygen, and store the carbon. If it is a long living tree, it can store that carbon for hundreds of years.
Why is carbon-14 not useful to date rocks?
Although radiocarbon dating provides a useful tool there are some things that may make an artifact unsuitable for this process.The artifact is made from the wrong type of material.Carbon dating relies on measurement of radioactive decay from carbon 14 isotopes, some materials naturally do not contain enough carbon to date them.Radiocarbon dating is a destructive process. In order to conduct dating on an artifact you need a sample of it. Although this sample may only need to be very small, some artifacts are too precious to damage in this way.There may not be enough of it.Even if the sample is suitable in every other way, if you don't have enough of it then you cant do the test. Modern methods mean you may only need tiny amounts of carbon from the sample (0.1g) but depending on how much carbon is naturally in the material, this may translate to a fair amount of the original artifact. Carbon dates from small amounts of material also tend to be less accurate, and ideally you want to run several tests to be sure.The artifact may be too old. Radiocarbon dating is only effective back to a certain point. Beyond this there may not be enough radioactivity left in the sample to measure it. Also, radiocarbon dates need "correcting" on a calibration curve to correct the discrepancy between the age given in radiocarbon years and actual calendar years. Beyond around 45,000 years ago this curve is not so effective, and the remaining carbon-14 in the sample may be too small to measure.The artifact may be too young. Radiocarbon dating relies on the exchange of carbon through the carbon cycle. Recent human activity has affected the amounts of carbon in the atmosphere making carbon dating far less effective more recently than the early 1700. This is because processes such as the release old carbon into the atmosphere through the burning of fossil fuels and atmospheric nuclear weapons testing have led to dramatic peaks and dips in the amount of carbon 14 in the atmosphere.The sample may be contaminated.Contamination may occur before or after sampling and cause errors in the date that is produced. For example, water can disolve and deposit organic material changing the isotope levels. However, in most cases this can be dealt with in the lab during the sample preperation process. Archaeologists also take steps when selecting and recovering samples to minimise this potential problem.
What can carbon-14 dating be used on?
Mainly on stuff from living beings - it is the living beings that take in carbon during their life.
Which isotope is useful for dating wood and charcoal that is less than about 75000 years old?
Carbon-14 is the isotope commonly used for dating wood and charcoal less than about 75,000 years old. This isotope is useful because plants take in carbon-14 while they are alive, and it decays at a known rate after the plant dies, allowing for accurate dating.
How long does it take to complete the carbon cycle?
5 years
How long on average does it take for things to get physical between a guy and a girl after they start dating?
It depends on when you are ready, not how long it has been.
What is mean by dating?
The actual meaning of DATING is to get to know the partner better to prepare for a long-term relationship. People these day take advantages of DATING to a far level that can be express in different ways. PEACE
How long will it take for you to complete your online dating profile?
It depends on which online dating profile you are signing up for, because websites such as match.com or harmony.com might have different time requirements for you to fill your dating profile.
How long does it take for a home test to give you the result?
9 months.
How long do you have to take fish oil before if lowers cholesterol?
How long do I have to take fish oil?" and after how long I can get the result ? Taking fish oil I will not gain weight
What happening in your bodies that result in carbon dioxide being breathed out?
well you are providing something for plants to take in and then again poltuing our world
How long will it take to result of pregncy blood test?
It will normally take one or two days to get the result of a pregnancy blood test. This test will be carried out at your doctor's surgery.
Which greenhouse gas is the result of deforestation?
Trees take in vast amounts of carbon dioxide. If we cut down the trees then this great sink disappears.
How long is from fingerprints to citizenship interview 2011 in NEWARK?
How long take fingerprint result for us citizenship,?2012
