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If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Science Biology History of life on Earth Carbon dating animation dating.

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Chronometric revolution. Potassium-argon K-Ar dating. K-Ar dating calculation. Carbon dating animation number, atomic mass, and isotopes. Current time: Video transcript What I want to do in this video is kind of introduce you to the idea of, one, how carbon comes about, and anination it gets into all living things.

And then either later in this video or in future videos we'll talk about how it's actually used to date things, how we use it actually figure out that that bone is 12, years old, or that person died 18, years ago, whatever it might be.

So let me draw the Earth. So carbon dating animation me just draw the surface of the Earth like. It's just a little section of the surface of the Earth. Datint then we have the atmosphere of the Earth. I'll draw that in yellow.

Need figure Rolphton, Ontario then you have the Earth's atmosphere right over animatoon. Let me write that down, atmosphere. And I'll write nitrogen. Its symbol is just Carbon dating animation.

Carbon dating animation it has seven protons, and it also has seven neutrons. So it has an atomic mass of roughly Then this is the most typical isotope of nitrogen. And we talk about the word isotope in the chemistry playlist. An isotope, the protons define what element it is.

But this number up here can change depending on adting number of neutrons you. So the different versions of a given element, those are each called isotopes. I just view in my head as versions of an element. Carbon dating animation anyway, we have animatoon atmosphere, and then coming from our sun, we have what's commonly called cosmic rays, but they're actually not rays. They're cosmic particles. You can view them as just single protons, which is the same thing as a hydrogen nucleus.

They carbon dating animation also be alpha particles, which is the same thing as a helium nucleus. And there's even a carbon dating animation electrons. And they're carbno to come in, and they're going to bump into things in our atmosphere, and they're actually going to form neutrons.

So they're actually going to form carbon dating animation. And we'll show a neutron with a lowercase n, and a 1 for its mass number. And we don't write anything, because it has no protons down.

Like we had for nitrogen, we had seven protons. So it's not really an element.

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It is a subatomic particle. But you have these neutrons form. And every now and then-- and let's just annimation clear-- this isn't like a typical reaction. But animtaion now and then carbon dating animation of those neutrons will bump into one of the nitrogen's in just carbon dating animation right way so that it bumps off one of the protons in the nitrogen and essentially replaces that proton with.

So let me make it clear. So it bumps off one of the protons.

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So instead of carbon dating animation protons we now have six protons. But this number 14 doesn't go down to 13 because it replaces carbon dating animation with. So this still stays at And now since it only has six protons, this is no longer nitrogen, by definition. This is now carbon. And that proton that was bumped off just kind of gets emitted.

So then let me just do that in another color.

Half-life simulation, carbon dating and radioactive decay

carbon dating animation So plus. And a proton that's just flying around, you could call that hydrogen 1. And it can gain an electron some ways. If it doesn't gain an electron, it's just a hydrogen ion, a positive ion, either way, or a hydrogen nucleus. But this process-- and once again, it's not a typical process, but cam bdsm happens every now and then-- this is how carbon forms.

So carbon dating animation right here is carbon You can essentially view it as a nitrogen where one of the horny girls Provincetown is replaced with a caebon. And what's interesting about this is this is constantly being formed in our atmosphere, not in huge quantities, but in reasonable quantities.

So let me write this. Constant formation. And let me be very clear.

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Let's look at the periodic table over. So carbon dating animation by definition has six protons, but carbon dating animation typical isotope, the most common isotope of carbon is carbon So carbon is the most common. So most of the carbon in your body is carbon But what's interesting is that a small fraction of carbon forms, and then this carbon can then also combine with oxygen to form carbon dioxide.

And then that carbon dioxide gets absorbed into the rest of the atmosphere, into our carboh.

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It can be fixed by plants. When people talk about carbon fixation, they're really talking about using mainly light energy from the sun to take gaseous carbon dating animation and turn it into actual kind of organic tissue.

And so this carbon, it's constantly being formed. It makes its way into oceans-- it's already in the air, but gay videochat free completely mixes through the whole atmosphere-- and the air. And then it makes its way into plants. And plants are really just made out of that fixed carbon, that carbon that was taken in gaseous form and put into, I guess you could say, carbon dating animation kind of a solid form, put it into a living form.

That's what wood pretty much is. It gets put into plants, and then it gets put into the things that eat the plants.

Radiocarbon, or Carbon, dating is probably one of the most The animation provides an example of how this logarithmic decay occurs. In this video excerpt from NOVA: "Hunting the Elements," New York Times technology columnist David Pogue explores how isotopes of carbon can be used to. Animated lesson with interactive activities, simulations and adaptive test introducing why radioisotopes have a half-life and how it can be calculated.

So that could be us. Now why is this even interesting?

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I've just explained a carbon dating animation where some of our body, even though carbon is the most common isotope, some of our body, while we're living, gets made up of this carbon thing. Well, animatjon interesting thing is the only time you can take in this carbon is while you're alive, while you're eating new things.

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Dxting as soon as you die and you get buried under the ground, there's no way for the carbon to become part of your tissue anymore because you're not eating anything with new carbon And what's interesting here carbon dating animation once you die, you're not going to get any new carbon And that carbon that you anijation have at you're death is going to decay via beta decay-- and we learned about this-- back into nitrogen So kind of this process reverses.

So it'll decay back into nitrogen, and in beta decay you emit an electron and an electron anti-neutrino. I won't go thai massage sebastopol the details of. But essentially what you have happening here is you have one of the eating is turning into a proton and emitting this stuff in the carbon dating animation.

Now why is this interesting? So I just said while you're living carbon dating animation have kind of straight-up carbon And carbon is constantly doing this decay thing.

In this video excerpt from NOVA: "Hunting the Elements," New York Times technology columnist David Pogue explores how isotopes of carbon can be used to. Animated lesson with interactive activities, simulations and adaptive test introducing why radioisotopes have a half-life and how it can be calculated. Ever wondered how scientists know the age of old bones in an ancient site or how old a scrap of linen is? The technique used is called carbon dating, and in this.

But what's interesting is as soon as you die and you're carbon dating animation ingesting anymore plants, or breathing from the atmosphere if you are a plant, or fixing from the senegal hot girl. And this even applies to plants.

Once a plant dies, it's no longer taking in carbon dioxide from the atmosphere and turning it into new tissue. The carbon in that carbon dating animation gets frozen. And this carbon does this decay at a specific rate. And then you can use that rate to actually determine how long ago that thing must've died. So the rate at which this happens, so the rate of carbon decay, is essentially half disappears, half gone, in roughly 5, years.

And this is actually called a half life. And carbon dating animation talk about in other videos.