GCSE Physics - Radioactive Decay and Half Life #35

[@shrividyatavanam5788]

Alright, this guy is too underrated!! Push him to the top please, he deserves it!

[@ciaramulgrew4568]

yeaaa

[@ellamcdougall6373]

this guy taught me more in 6 minutes than my physics teacher can in a week

[@AS-rq6tr]

*ever

[@ellamcdougall6373]

@@AS-rq6tr aha tru :))

[@Kamabakogonpachiro]

My physics teacher is shit

[@snoopdogssb2]

im sure you didnt learn how to make gravity gun from ur physic teacher

[@IGCSEX]

fr fr ;)

[@isabellaaslam9372]

i'm sorry but this guy is better then free science lessons. I learn so well from cognito like fully he is so easy to understand. He might actually save my GCSE grade!! I hope this video does me well for Wednesday's mock. (update: he did save my gcse and now i am in the sixth form i wanted to go to :) )

[@freyaa1200]

hope it went okay! i have mine in the afternoon 🥴🥴

[@isabellaaslam9372]

@@freyaa1200 i did terribly on physics because it was all the waves topic which was the one topic i didn't revise but it's okay i'll make up for it in biology and chemistry i hope. good luck for the paper you probably just sat :)

[@freyaa1200]

@@isabellaaslam9372 omg ahhh unlucky! mine was on all of the equations that we had to learn involving kWh, forces, solar panels efficiency and radiation but i didn't enjoy it at alllll hah it wasn't terrible but it was the stuff i revised the least :( thanks tho! i'm sure your chem and bio will be great! - i defo prefer these hha i've got maths non calc and spanish tomorrow, good luck on yours and i hope you have a lovely weekend :) x

[@isabellaaslam9372]

@@freyaa1200 thank you! good luck and have a lovely weekend too :)

[@freyaa1200]

@@isabellaaslam9372 tyyyy xx

[@Cognitoedu]

If you’d like to practise what's covered in this video, check out the lesson on the Cognito platform - cognitoedu.org/coursesubtopic/p2-gcse-aqa-h-t_8.05. The platform’s totally free, and has been built to make learning and revision as easy as possible. The main features are: - Lessons organised by topic, only the lessons relevant to your specific exam board and tier are shown. - Automatic progress tracking. Progress bars tell you what you’re doing well at, and what you need to spend some time on. - Practise quizzes so you can test your knowledge. You can quiz yourself on any combination of topics you like. - A huge number of fully-hinted questions that take you step-by-step through some of the trickiest calculations & concepts. - A comprehensive bank of past exam papers, organised both by year, and also by topic. Amadeus & Tom

[@nehalsonar7681]

Total lifesaver! 🥹🥹

[@Parky64]

Where’s the funny screaming scientists and silly Star Wars lookin aliens?

[@D00000T]

its gotten to a point where people need to specify which half life they're talking about

[@gastricacid]

@@dauzlee2827 YES HAHAHA!!!! WHICH ONE IS HE TALKING ABOUT!!!!???????

[@garysheldon1739]

Like the game

[@prostatecancergaming9531]

That’s a good thing

[@zombiekinggamer]

Noice one

[@midnightvibes1167]

@R_of_L Productions frrrr

[@fizastudies7000]

honestly these videos are a lifesaver. And thats the biggest understatement!! Love your channel

[@Hoodperd]

Rise and shine, Mr Freeman.

[@seowyy]

Not that I wish to imply you have been sleeping on the job

[@electroblastz]

@@seowyy No one is more deserving of a rest... and all the effort in the world would have gone to waste until... well, let's just say your hour has... come again.

[@MD-dw5ee]

@@electroblastz The right man in the wrong place can make all the difference … in the world. So, wake up, Mister Freeman. Wake up and … smell the ashes.

[@Anti_Racist696]

​@@MD-dw5eeI didn't see you get on

[@amnababar6681]

This guy is much more talented than my physics teacher..If I hadn't watched it on the first place,maybe it would take me a week to understand this concept...mister your knowledge is appreciated 👍💞

[@RecklessRat6900]

I have end of years exams around these topics and you were a great help to help me revise . I don’t know where I would be in revision without this channel , you just earned another subscriber

[@jahnavi_9]

This video legit saved my life. I learnt this about 2-3 weeks ago in class and never understood, here I am today one night before my test and I get everything. Bro you're gonna save my GCSEs.

[@CeNNteR]

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

[@adventurelinetm.]

Gordon doesn’t need to hear all this. He’s a highly trained professional!

[@dec1597]

Great video thank you I like to watch your videos one at a time every so often. Rounds my knowledge so that hopefully I’ll have good overall knowledge when it comes to my mocks and GCSEs

[@Cognitoedu]

Hey, thank you for taking the time to leave us a comment! We really appreciate it! That’s a great strategy - little and often will get you well prepared! Good luck with all your work! 🤙

[@roriefriz9068]

Broooo why do u explain everything so well? First, I was like I don't get it, but especially when you go do the exercises on your page and look back on the video, everything makes so much sense. Applying your knowledge really helps things stick better I find THankss

[@Cognitoedu]

Glad it's helping Rorie!

[@orangeroad_]

@@Cognitoedu weird name isn't it

[@daf_eed]

teaching myself chem bio and physics so thank you for explaining everything - I’ve recommended u to basically everyone Ik

[@Cognitoedu]

Ah thank you! Glad you've found the channel helpful

[@lossycompressed]

i was looking for a physics analysis from the *game* "Half-Life", but science is cool

[@wumbr6467]

Rise and shine Mr. Freeman... Rise and shine...

[@Jigaski]

00:05 Understanding activity and half-life in radioactive decay 00:51 Understanding radioactive decay: activity and half-life 01:38 Understanding Radioactive Decay and Half Life 02:28 Radioactive decay leads to decreasing overall rate of decay 03:20 Understanding radioactive decay graphs 04:05 Radioactive decay rates vary based on the specific radioactive sample. 04:52 Understanding radioactive decay and count rate 05:37 Calculating radioactive decay through half-life concept

[@ahmadqasim4773]

Youre videos are SOO helpful, i have no idea how u're not on a million subs yet. Keep up the good work 😉

[@staceixan]

gordon freeman is a highly trained professional!

[@seowyy]

He doesn't need to hear all this!

[@alisonmurchie7249]

Thank you, I was really struggling with understanding half- lives and watched many videos to try help me with it but they didn't help. Now I understand, thanks!

[@YZYE]

Personally, I prefer the game.

[@vanburnjackson]

Ye

[@Panpan-v9b]

Which one

[@A.ITutoring]

I knew someone would say this 😂

[@productiveAccount-v3k]

i kept thinking this during physics lmao

[@mintyisntaken5454]

Half-life Alyx on top 🔥🔥

[@ken-cb4no]

wow, you explain things incredibly well! I came to your video because I was super confused in class but now you have made my mind so much more clearer!

[@CasterOfDreams]

Gordon doesn’t need to hear all of this, he’s a highly trained professional - half life game scientist

[@meenakshibhat6713]

Who's Gordon?

[@CasterOfDreams]

@@meenakshibhat6713 he’s from a video game called half life

[@meenakshibhat6713]

Oh

[@lottieMartin-rc9gz]

OMG IVE BEEN STRUGGLING WITH THIS TOPIC FOR AGES IT JUST DIDNT MAKE SENSE AND THIS GUY JUST PRASED IT IN A WAY I JUST GOT IN 10 SECONDS I LOVE THIS MAN

[@tech-with-zaid]

This is the only channel that I've actually turned on the notifications of!! Just understood this topic after my physics lesson this week!

[@Naomi-ii5rd]

you explain everything in such a clear way. this is the 3rd video i have watched about this subject and this is the first video that has actually helped me understand it thank you!!!

[@choyou3932]

As a bio student, thank you for saving me. I literally hate the fact that my textbook often doesn't explain these concepts even if its nuclear physics.

[@sheehhdjejddj2730]

My bro this is physics

[@success-gt8pi]

@@sheehhdjejddj2730 its also bio if your doing medicine i think

[@noahm9976]

You're literally the best teacher I have. Love your videos :)

[@Cognitoedu]

Thanks Noah, really appreciate it 😊

[@alax5699]

I am new immigrants to UK,just join year 11,as my English not really good,I try very hard to listen to English,and work hard in science,thanks a lot,I learn many from this channel,but if there have subtitle,that will be perfect

[@dvrina]

good luck i wish you all the best!

[@Lwhattt]

Hope your exams went well!

[@spyonmebaby]

"Silly Valve, It's not 'One, two, Alyx.' it's one, two, thirty-five!"

[@Laiser]

Ha! Funny

[@cintiasosacawen5422]

Thanks !!!!!! I liked the explanation and graphs :)

[@WildBoy200Yaboi]

I always hear half life and I have no clue what it meant, this actually helps, Thank you so much! :D

[@DykarDyksson]

People are probably referring to the game

[@tob8]

How does the gravity gun work

[@mrsalden8652]

this videos are so brilliant and clear - so easy to understand! deserve so many more subscribers, these videos are such a help.

[@Cognitoedu]

Hey thanks for such a kind comment! Really happy to hear you’re finding them useful 🙌

[@kaziasefrahman9286]

BRO THE THING I COULDNT LEARN FOR MONTHS THIS GUY JUST TAUGHT ME THIS IN 5 MINS

[@Jominer08]

thanks for the video, i was really confused about the n=t/t1/2 formula i had before but this vid explained it at the end so thanks!

[@Muv22HD]

Rise and shine, Mister Freeman, rise and.. shine..

[@Ember_s_]

I finally understand how to calculate half line on a graph ,thank you

[@mohammadhashir1596]

bro wow i have an test tomorrow on this so thanks a lot

[@yeppie.yoo0]

is this how it feels like to finally understand something?? my physics mock is tomorrow and i keep forgetting the half life concept for some reason .... tysm wish me luck!

[@MrKK-gn5ml]

someone get this King his crown

[@hongjoongswife9672]

You are amazing, I finally understand this properly now.

[@Cognitoedu]

Aha that’s greats to hear! Thanks for your support and good luck with all your work!

[@Zen_Power]

Great video! I actually calculated the answer correctly at the end to my surprise. I ❤️ science!

[@chloex971]

same!

[@Zen_Power]

@@chloex971 I randomly wanted to learn about radioactive decay because of the Chernobyl series and also because of Fukishima and this video was really helpful.

[@darkwaveknight9751]

Omg thank you. You explained it much better than my physics teacher. Life saver!

[@guitarizzt]

This really helped man god bless you fr

[@Cognitoedu]

You’re welcome, good luck with all your work :)

[@TheUltimateSpider_Man0]

All i can image is a scientist escaping a facility called black mesa

[@captain-101entertainment]

Amazing, you need to be more famous 👍

[@Tlf1625]

rise and shine, mr freeman, rise and shine....

[@chloex971]

Thank you so much! Really helped to understand :))

[@MineHarderYTPS]

ut = Unit of time (e.g. days, weeks, etc) specified in question uh = unit in hours (e.g. day = 24 hrs) ut __ uh = how many half lives p = how many half lives 3,000,00 ÷ 2^p

[@khadija2625]

Seriously helpful, thank you

[@heisenberg578]

i see where the half life decay dlc got its name from

[@MohammadMujtabaSharifi]

Can you tell me the problems associated with radioactive isotopes

[@gachamovies_cvz]

love your content man keep this up :D

[@cyberconsumer5144]

Very helpful and easy to learn!

[@shade3449]

this video just made half life surprisingly uncomplicated for me

[@artemius5513]

"where headcrab?" - some kid

[@rahmanhara6509]

Thank you very much for the excellent explanation.

[@damilolaiyiola8021]

I really hope all this knowledge I gain here helps me get a grade 8 in physics chemistry and biology and I'm able to do physics in a level as I want.

[@Naeem-ur-RehmanNaqvi]

wait... this isnt half life 1 walkthrough (No commentry) :(

[@patriciaedithavictorio1672]

Thank you for the clear explanation. How do we calculate when the decay constant is given?

[@naimuhinyi9557]

great videos! you presented everything in such a digestible way. thanks alot

[@thereal7mood3311]

Gordon doesn't need to hear all this he's a highly trained professional.

[@hnedtz]

Nice work😎

[@edbud6302]

sheesh this is very helpful thank you

[@eliziwazaskal]

Where's the 3 half life coming from in the question??

[@queenielo1759]

5 days x 24 hours =120 hours 40 hrs=1 half-life number of half-lifes= 120/40= 3 half-lifes

[@xved2730]

Thank you so much 👏

[@darkspace1350]

3:09 those isotopes are REALLY distracting, it held my focus for a long time. Great video though, helped alot :D

[@coffeepot.640]

So, if I had 1kg of a radioactive substance, and its activity was, say, 30Bq. If I had 20kg of it, would the activity be the same, or would it multiply by 20?

[@ultraferal6138]

where’s gordon freeman

[@MakeriNicholasopanguzi-eq7kt]

I have a question.sodium-24 decays at a rate of 2.6 per day,calculate it's half-life?

[@MakeriNicholasopanguzi-eq7kt]

Sorry the question was sodium-24 decays at a rate of 2.6 count per day , calculate it's half life

[@quivurr]

if it weren't for this video my GCSE score would've resulted in unforeseen consequences

[@starplatixum]

would've been an anomalous material tbh

[@ryze5436]

What an awesome video With perfect explanation Thank you.

[@henryclarke9082]

🤝thank you my friend

[@mnear4521]

I never thought i would use cognito for things other than... you know... (nope you naughty naughty) eductaional purpose. Thank you Cognito so much.

[@ashfiaferdousi8367]

Why doesn’t the curve graph reach or touch the x-axis if the activity has stopped?

[@Cognitoedu]

Hi, theoretically the activity doesn't stop because it only decreases by half each half-life. And if you keep halving something you can't reach 0

[@ashfiaferdousi8367]

@@Cognitoedu thank youuu

[@fshahnawaz]

But,instead of dividng the no. of nuclei by the no. of half-lives, we can just take the no. of half-lives as an index of 2, rght?

[@muhammaddanyal7272]

plz prepare the lesson for tunelling of alpha particle bcz i have a problem in this topic

[@nadidshawban2004]

Could you make videos on astrophysics , electricity &waves (physics igcse)

[@hanadiyousif5637]

He is amazing brahh!!

[@user-ni6uo9up9e]

GOOD LUCK FOR 2023 EXAMSSS

[@zooty-t6h]

for the last question u can just do 3,000,000 divide by 40 multiplied by 5 for a shorter method

[@niamalkubi406]

Thank you , super clear

[@sameersh4h]

In the question at the end, I did (5/40) x 3,000,000 Which equalled the same answer, 375,000. I don't know how my brain saw this as logic or how I did that but is this method also correct??

[@Elisa_k424]

So helpful

[@mullfehlfunktion6304]

Thank you SOO MUCH

[@L.S.Y.T]

How do i bhop?

[@mantosh56]

Thanks for the vid :)

[@beckyhiskyas122]

How do you calculate a half life? Also thanks this video was very helpful!!

[@unkownbot5601]

Becky Hiskyas Just look at the graph and find the time taken for half the nuclei to decay.

[@PandaThatsRed]

I'm a little late but what do I do if the amount of half lives are a decimal?

[@yeehaw_town3414]

doctor freeeeemaaaan

[@nateniezgoda1964]

Ok, can someone explain this to me? I just cant figure it out. If there were an istoped with a half life of one year and you possessed 2 samples of it. Sample A) 10lb and sample B) 1lb. After one year would you have 5lb of A and 1/2 of B? If so then it would seem that the decay rate isn't the same. Bc you managed to decay 5lb in one year in sample A but in sample B only 1/2 pould decayed after 1 year. What am I missing?

[@jhonsillosanchez8494]

Hello, idk if you already got an answer to this since it's been 2 months. The thing is that since the atmos have a certain chance of decaying after a certain time, see it like this. Every second, each unstable atom throws a dice, if it lands on 1, it decays into a stable atom, if it lands on any other number, then it will continue being unstable. So, every second, each atom has a chance of decaying of 1 in 6. That means that after the first second we'd expect a sixth of our original sample to become some other element, so we're left with 5/6 of what we began with, if we had 36 atoms at first, we would now have 30, we lost 6 atoms. Then, after the next second, it's not going to be reduced by 6 again, now we're working with 30 unstable atoms, and since a sixth of them decay, we would now be left with 25, which is 5 less. Of course, in real life the chances are not a sixth every second. But with this example it's noticeable that decay is proportional to the sample, SO it's never a fixed amount. In your example it's first a 10lb sample and a 1lb sample, they decay into 5lb and 1/2 lb. In total it went from 11lb to 5.5 lb, proportion of decay stays the same.

[@mohammedabubaqar1470]

👍👍thanks bro

[@زيدمحمد-ر6ط]

رحم الله والديك

[@arnavgandhi9702]

thank you very much :) helped a lot

[@marlonraeoso2494]

If my half live is a decimal number, is it okay to just divide the # of substance to the # of half lives directly?

[@marlonraeoso2494]

Like if my half lives is 18.67

[@choyou3932]

Are you trying to carbon date?

[@maddyayay4649]

I love you cognito man

[@nnoossiirr]

NO! STAY BACK! GORDOONNN..... DAAAAAAAAAAAHHHH!

[@meenakshibhat6713]

Who's Gordon?

[@rexded]

@@meenakshibhat6713 Gordon freeman