according to modern scientific dating techniques, approximately how old is the solar system? This is a topic that many people are looking for. cfiva.org is a channel providing useful information about learning, life, digital marketing and online courses …. it will help you have an overview and solid multi-faceted knowledge . Today, cfiva.org would like to introduce to you How Carbon Dating Works. Following along are instructions in the video below:
Music hey. There and welcome to brain stuff. Im.
Josh clark. And this is is the brain stuff where i explain to you how carbon 14 dating works carbon dating. Which we also just call carbon dating is a form of radiometric dating and all it is is measuring the decay of a certain type of atom found in a once living organism to determine when it was last alive and all of this starts in the up up upper atmosphere of earth.
Where its constantly bombarded by cosmic rays. And one of the things. These cosmic.
Rays. Do is knock neutrons off of some atoms and protons off of others. And before you know it the nice stable family.
Nitrogen. 14. Atom is all wrapped up and gone.
Crazy. And becomes. Whats known as a carbon.
14 atom. Which is radioactive now carbon. 14 atoms arent the only ones in the upper atmosphere.
Theres also carbon 12 atoms carbon 12 atoms are in much more abundance and theyre pretty stable carbon. 14 atoms are again radioactive and unstable. But theyre formed at a reliable steady rate so at any point in time we have a pretty good idea of the ratio of carbon 12 atoms to carbon 14 atoms got that its important now carbon dioxide is essential to life here on earth plants breathe it in animals eat the plants we eat the animals and the plants and these carbon molecules carbon 14 and 12 that make up the carbon dioxide get in everything whats neat is that the ratio of carbon 12 to carbon.
Found in all these living things here on earth is pretty much the same as whats in the atmosphere. Which means. Its predictable.
And some very very smart scientists have figured out that carbon 14 actually decays at a predictable rate carbon 14 like all radioactive particles has whats called a half life now the half life is the amount of time it takes for the number of radioactive particles in a sample to decrease by half carbon 14 has a half life of. 5730 years that means that after 5730. Years.
The amount of carbon 14 atoms. In a plant that you found fossilized will be half of what it was the last time that plant took a breath of life after 11460 years. Which is two half lives therell be a quarter of the amount of.
Carbon. 14 that was originally present and then after 17190. Years.
Youll have just an eighth of the number of carbon.
14. And so on and so on until theres none left and this is actually one of the limitations of carbon 14 dating that eventually youre going to go far enough back in time that all of the carbon. 14 atoms have decayed and you dont know whether this took.
Place a day before or 100000 years before which means the time limit that you can date things using carbon 14 is roughly 50000 years. But as long as you are trying to. Date something that lived on earth within the last 50000.
Years. You can figure out roughly. When it was last alive.
The way that you do that is by measuring the rate of decay of carbon 14 atoms compared to the slow and steady carbon 12 atoms that are also present in there presto chango. Youve got some carbon 14 dating and all of a. Sudden you.
Say oh my god this wooden.
Axe handle is 12000. Years old pretty sweet stuff and this whole thing gets even more interesting when you realize that future. Archaeologists are going to have a lot of trouble using carbon 14 dating thanks to us humans of the present time our industrial activities have been pumping c 0.
2. Into the atmosphere and really messing with the ratio of carbon 12 to carbon. 14.
And even more astounding. All of the nuclear bombs. That we set off in the mid 20th century.
Well those messed with the atmospheric ratios. Too. So good luck with all of that future anthropologists and archaeologists sorry.
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