Half-life | Physics | Khan Academy

[@Manigo1743]

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?

[@МиланЖивковић-к9ъ]

Clicked cause of the game, stayed out of curiosity. Wasn't dissapointed.

[@A_Good_Boy.]

do you know? they copied the main place from counter strike half-life game in the current Loki season 2

[@Nived_69]

@@A_Good_Boy. i thought they just had a copy of the stun baton

[@subjectnether959]

"Gordon doesnt need to hear all this, he's a highly trained professional."

[@Ulysses_S_Grant1870]

Gordon doesn’t need to hear all of this, he’s a highly trained professional

[@Mahesh_Shenoy]

‘Please, leave me alone until after the experiment!’

[@Urstrulyharsha.srk2277]

Lol

[@ipalomino2182]

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]

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.

[@ibraheimsalam4345]

Well explained

[@mannatbhatia8854]

Khan Academy never fails to explain things perfectly!

[@CristuelCasto]

It's a great game.

[@rainingng7960]

λ

[@manoprakash2674]

That was awesome. Keep up the good work.

[@scarletspidernz]

Half Life 3 Confirmed

[@gagelol]

3 months ago is clutch

[@iwuvu5940]

Ah yes, my favorite video game ever

[@FOOTBALL-hw1qy]

Why half life is 5730? Why not something else? Cz the atmosphere around the globe is not the same!

[@annettegutierrez3715]

POV: VALVe copyright infringement???

[@manjugagare802]

Wouldn't this apply that all carbon atoms should decay into nitrogen

[@user-hxh12369]

Wow 😲.

[@NishantSingh-zx3cd]

Carbon ka 14

[@SajiSNairNair-tu9dk]

😂👉jest 🕵️chintamani 🥰