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The half life of a radioactive substance is the time it takes for half of that substance to undergo radioactive decay. In some substances, like carbon 14, the proportion of it in a living being can be estimated, so the amount of it left in a sample correlates to the time since that sample was alive. Other substances, like, for example, Potassium 40, decays into Argon 40. The ratio of K40 to Ar40 in rock samples gives the age of some igneous rocks.
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∙ 10y ago
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∙ 12y agoby its radio active decay.
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Which is the next stable element after uranium?
none, uranium itself is unstable, there are no stable elements after bismuth; and even some researchers suggest that bismuth is an unstable radioactive element with a halflife approaching twice the age of the universe.
Can you tell the age of the earth from fossils?
no but you can tell the age of the fossil from the age of the rock around it, you cant tell the age of the earth from fossils is because animals with bones were didnt exist until later in the earth's "life"
What Carbon isotope used in dating things in archeology?
This is carbon 14 -(14C). see wikipedia-" http://en.wikipedia.org/wiki/Radiocarbon_dating" if you need an explanation as to how the measurements are made and how the age of a sample is calculated.
Uranium-235 has a half life of?
The half-life is 700 million years !
Are radioactive isotopes used to determine the absolute age of rocks?
Harry and Herminoe Cast A Spell And Say "Spill me off a like tell me the age of da ignbous rock" and bam!|
Can the age and sex be determine by hair sample?
Usually, yes, you can get a rough guesstimate of a persons age from their hair sample, you can usually tell male or female also.
What is used to determine the absolute age of a sample?
Carbon dating. Google it
What type of objects would you do carbon dating on?
On an object with unknown age but more than halflife of C
How old was the iceberg that the Titanic hit?
There is no way to know how old it was. Today ice samples are taken of glaciers that can tell the age of the glacier, but to tell the age of an ice burg is nearly impossible without a sample.
The techniques used to find out something about a population such as their average age based on a sample are referred to as?
A Census
How are tree rings used for dating?
Trees in places with clear seasons grow one ring each year, so by counting the rings you can find out the age of the tree. Also, the rings vary in thickness depending on the weather, so by matching the wide/narrow sequence from a known tree to an unknown sample of wood it's possible to tell the age of the unknown sample.
How is hair used to tell the age of a person?
Hair can be used to tell the age of a person by determining the levels of proteins and pigments found in a strand. This can only be done by scientific testing though.
A survey of 35 students of a university showed a sample mean age of 21.7 with a standard deviation of 3.1 years What is the point estimate of the students' mean age?
It is the sample mean age of 21.7.
What uses the ratio of parent to daughter material found in a sample to find the sample's age?
rudametric dating
Can you tell age from a blood sample?
Yes. In a similar way that scientists can use carbon dating to determine the age of fossils, a new method allows an individuals age to be determined from their blood. X-ray florescent spectroscopy allows the bloods plasma to be analyzed with enough precision to determine age within the year.
How can you tell the age of your dog?
how can i tell the age of a dog
The half-time of an element is important for determining the?
...age of the sample.
