Half-life | Physics | Khan Academy
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Half-life is the time required for half of a radioactive sample to decay. Half-life cannot be changed-nuclei cannot be forced to decay faster or slower. Additionally, we cannot predict when an individual nucleus will decay. However, when analyzing a large sample containing many nuclei, half-life allows us to predict how much of the sample will remain after a given amount of time. This is useful for radiometric dating.
Sections:
00:00 - Intro
00:34 - What is half-life?
03:26 - Coin toss analogy
05:50 - Radioactive decay is spontaneous
06:37 - Why care about half-life?
07:20 - Decay graph
08:30 - Radiometric dating
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Пікірлер: 22
"Gordon doesnt need to hear all this, he's a highly trained professional."
Clicked cause of the game, stayed out of curiosity. Wasn't dissapointed.
@A_Good_Boy.
5 ай бұрын
do you know? they copied the main place from counter strike half-life game in the current Loki season 2
@Nived_69
3 ай бұрын
@@A_Good_Boy. i thought they just had a copy of the stun baton
Gordon doesn’t need to hear all of this, he’s a highly trained professional
‘Please, leave me alone until after the experiment!’
@Urstrulyharsha.srk2277
5 ай бұрын
Lol
But how do we know that uranium has a half-life of 4.5B years? It is not like we can sit around and wait to see how long it takes for half of it to disappear. Even with a large amount, and waiting for something like 100 years, would it even be noticable?
Well explained
It's a great game.
λ
Nice video, thanks. But how do we know that the half-live of C14 is 5730 years? Radioactivity was discovered on the 19th century, right?
@christinejackson6630
5 ай бұрын
True, but the decay of any radioisotope follows an exponential decay curve as shown at 8:42. So, even if we’ve observed a sample for less than one full half-life, we can measure how much of the parent remains after that time. Then we can extrapolate the rest of the decay curve and determine the radioisotope’s half-life.
That was awesome. Keep up the good work.
Half Life 3 Confirmed
Ah yes, my favorite video game ever
Wow 😲.
3 months ago is clutch
Wouldn't this apply that all carbon atoms should decay into nitrogen
Why half life is 5730? Why not something else? Cz the atmosphere around the globe is not the same!
POV: VALVe copyright infringement???
😂👉jest 🕵️chintamani 🥰