Between now and next week, investigate some genuine elements used in radioactive dating of rocks and fossils, and answer the following questions: . a. are some radioisotope pairs more appropriate for dating certain types of samples? if so, which ones and why? can all rocks be dated by radiometric methods? why or why not? what other information can be used to determine the age of rocks or fossils? b. c.
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This Post Has 10 Comments
it would be the first one
Explanation: i just took the test bro trust me
I Big Bran
c. If you are using usatesprpe
It tells when a fossilized organism was born. It tells where a fossilized organism was found.
Explanation: Because it is A
i think its fossils that are sued in radioactive dating because index fossils are fossils that are useful for dating and correlating the strata in which it is found, and radioactive dating is the only option that has to do with finding time.
i'm not sure at all please do a little more research before putting my answer down
Answer : The chemical symbol for the element that results from this process is, (Ar) for argon.
Electron capture : In this decay process, a parent nuclei absorbs an electron and gets converted into a neutron. Simply, a proton and an electron combines together to form a neutron. Mass number does not change in this process.
The equation for the given reaction is,
Thus, the chemical symbol for the element that results from this process is, argon (Ar).
C) The half life of carbon-14 is about 5700 years and is too short to date rocks.
The practical limit for carbon dating is about nine half-lives (50 000 yr).
At that point, the amount of carbon remaining has dropped to about 0.2 % of the original amount.
The experimental uncertainties involved become so large that carbon dating is no longer reliable.
Most rocks hundreds of millions or even billions of years old.
Any radioactive carbon would have long since decayed to unmeasurable levels.
A) is wrong. Many rocks contain carbon, but they are so old that the amount of radioactive carbon has dropped below measurables.
B) is wrong. The half-life of carbon is too short to use for dating rocks.
D) is wrong. About 20 % of the carbon in rocks comes from living things that were embedded in layers of mud.
Uranium-238 and lead-206 have half-lives of 4.5 × 10⁹ yr, which is about the age of the Earth.
Even the oldest rocks would still have half of their radioactivity, and younger rocks would have more.
Thus, U-238 and Pb-206 are ideal isotopes for measuring the ages of rocks.
Organisms that existed over a limited period
Index fossils are organisms that existed within a limited period in the geologic record.
These fossils are indicator fossils that serves as guide to define the relative ages of rocks in a sequence.
Here are some characteristics of index fossils:
they must have existed over a limited period in their history. they must be very distinctive with short evolutionary tend. they must be abundant and highly widespread in the stratigraphic column.
isotope describes the amount of time that it takes half of the isotopes in a sample to decay. in the case of radiocarbon dating, the half life of carbon 14 is 5,730years