GCSE Physics - Radioactive Decay and Half Life #35

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This video covers:
- How radioactive decay works
- What activity means
- The two definitions of half-life
- How to show radioactive decay on a graph
- How we can find the count rate with a Geiger-Müller tube
- Example calculation for radioactive decay
General info:
- Suitable for all GCSE and IGCSE courses
- See below for whether it is higher or foundation tier for your exam board
- See below for whether it is triple or combined for your exam board
Exam board specific info:
AQA - Everything is relevant to your course!
IGCSE Edexcel - Separate science and higher tier only
Edexcel - Everything is relevant to your course!
OCR 21st Century - Everything is relevant to your course!
OCR Gateway - Measuring half-life using graphs and calculating involving half-lives are only for higher tier
Related videos/topics:
GCSE Chemistry playlist:
• GCSE Chemistry - Atoms...
GCSE Biology Playlist:
• Video
GCSE Physics Playlist:
• Video
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Опубликовано:

30 июн 2024

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Комментарии : 255

@ellamcdougall6373 2 года назад

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

@AS-rq6tr 2 года назад

*ever

@ellamcdougall6373 2 года назад

@@AS-rq6tr aha tru :))

@Kamabakogonpachiro Год назад

My physics teacher is shit

@snoopdogssb2 Год назад

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

@IGCSEX 10 месяцев назад

fr fr ;)

@D00000T 3 года назад

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

@gastricacid 3 года назад

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

@garysheldon1739 2 года назад

Like the game

@prostatecancergaming9531 2 года назад

That’s a good thing

@zombiekinggamer 2 года назад

Noice one

@midnightvibes1167 Год назад

@R_of_L Productions frrrr

@Parky64 Год назад

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

@lil_thiccpeach9067 4 года назад

just learnt this today in class, was super confused but now it’s all clear thanks to you🙏👏 Edit: so it’s been 3 years lmao and i dunno why I’m updating this but I just wanted to thank this channel cuz I got A* in all my sciences:) I’m in uni now and yea thx for helping us out

@Cognitoedu 4 года назад

Aha thanks Lily - really happy it made sense to you!

@tutoryt5027 3 года назад

@@Cognitoedu agree

@ryankane2728 3 года назад

Same here

@JetStream_RPL Год назад

@@lil_thiccpeach9067 what major are you doing

@jamiedacoolest Год назад

i’m so proud of you!!!

@isabellaaslam9372 3 года назад

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 3 года назад

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

@isabellaaslam9372 3 года назад

@@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 3 года назад

@@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 3 года назад

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

@freyaa1200 3 года назад

@@isabellaaslam9372 tyyyy xx

@shrividyatavanam5788 3 года назад

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

@ciaramulgrew4568 Год назад

yeaaa

@Cognitoedu 2 года назад

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

@YZYE 3 года назад

Personally, I prefer the game.

@vanburnjackson 8 месяцев назад

@PanasheAlifaneti-nw7rv 7 месяцев назад

Which one

@A.ITutoring 7 месяцев назад

I knew someone would say this 😂

@user-bc3np8zz5g 7 месяцев назад

i kept thinking this during physics lmao

@mintyisntaken5454 6 месяцев назад

Half-life Alyx on top 🔥🔥

@amnababar6681 5 месяцев назад

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 👍💞

@adventurelinetm. Месяц назад

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

@fizastudies7000 2 года назад

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

@lossycompressed 3 года назад

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

@CeNNteR Год назад

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

@jahnavi_9 2 года назад

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.

@Hoodperd 3 года назад

Rise and shine, Mr Freeman.

@seowyy Год назад

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

@electroblastz Год назад

@@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 8 месяцев назад

@@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 2 месяца назад

@@MD-dw5eeI didn't see you get on

@RecklessRat6900 Год назад

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

@dec1597 4 года назад

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 4 года назад

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! 🤙

@daf_eed 2 года назад

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

@Cognitoedu 2 года назад

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

@staceixan 2 года назад

gordon freeman is a highly trained professional!

@seowyy Год назад

He doesn't need to hear all this!

@ahmadqasim4773 Год назад

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

@sexhaver571 3 года назад

a bit disappointed this isn't a half life play through

@Cognitoedu 3 года назад

You and me both

@alisonmurchie7249 Месяц назад

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!

@cintiasosacawen5422 3 года назад

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

@roriefriz9068 2 года назад

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 2 года назад

Glad it's helping Rorie!

@orangeroad_ Год назад

@@Cognitoedu weird name isn't it

@ultraferal6138 2 года назад

where’s gordon freeman

@ken-cb4no 2 года назад

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!

@artemius5513 3 года назад

"where headcrab?" - some kid

@heisenberg578 2 года назад

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

@wumbr6467 Год назад

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

@khadija2625 3 года назад

Seriously helpful, thank you

@chloex971 3 года назад

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

@yeehaw_town3414 2 года назад

doctor freeeeemaaaan

@MrKK-gn5ml 3 года назад

someone get this King his crown

@Jominer08 4 месяца назад

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!

@alax5699 2 года назад

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 2 года назад

good luck i wish you all the best!

@Lwhattt 5 дней назад

Hope your exams went well!

@CasterOfDreams Год назад

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

@meenakshibhat6713 7 месяцев назад

Who's Gordon?

@CasterOfDreams 7 месяцев назад

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

@meenakshibhat6713 7 месяцев назад

@TheUltimateSpider_Man0 Год назад

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

@cyberconsumer5144 3 года назад

Very helpful and easy to learn!

@WildBoy200Yaboi 2 года назад

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

@DykarDyksson 6 месяцев назад

People are probably referring to the game

@yeppie.yoo0 2 года назад

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!

@rahmanhara6509 2 года назад

Thank you very much for the excellent explanation.

@Naomi-ii5rd Год назад

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!!!

@ryze5436 2 года назад

What an awesome video With perfect explanation Thank you.

@noahm9976 3 года назад

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

@Cognitoedu 3 года назад

Thanks Noah, really appreciate it 😊

@spyonmebaby 3 года назад

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

@Laiser 3 года назад

Ha! Funny

@tob8 2 года назад

How does the gravity gun work

@mohammadhashir1596 3 года назад

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

@choyou3932 3 года назад

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 3 года назад

My bro this is physics

@success-gt8pi 2 года назад

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

@naimuhinyi9557 4 года назад

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

@guitarizzt 2 года назад

This really helped man god bless you fr

@Cognitoedu 2 года назад

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

@niamalkubi406 3 года назад

Thank you , super clear

@mrsalden8652 4 года назад

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

@Cognitoedu 4 года назад

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

@Zen_Power 3 года назад

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

@chloex971 3 года назад

same!

@Zen_Power 3 года назад

@@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.

@Ember_s_ 3 года назад

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

@mantosh56 3 года назад

Thanks for the vid :)

@hn.soccer 2 года назад

Nice work😎

@kaziasefrahman9286 Год назад

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

@darkwaveknight9751 4 года назад

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

@xved2730 3 года назад

Thank you so much 👏

@patriciaedithavictorio1672 Год назад

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

@arnavgandhi9702 3 года назад

thank you very much :) helped a lot

@shade3449 Год назад

this video just made half life surprisingly uncomplicated for me

@edbud6302 Месяц назад

sheesh this is very helpful thank you

@hongjoongswife9672 4 года назад

You are amazing, I finally understand this properly now.

@Cognitoedu 4 года назад

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

@mc--13 8 месяцев назад

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

@hanadiyousif5637 2 года назад

He is amazing brahh!!

@user-ni6uo9up9e Год назад

GOOD LUCK FOR 2023 EXAMSSS

@damilolaiyiola8021 Год назад

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.

@lottieMartin-rc9gz 2 месяца назад

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

@Naeem-ur-RehmanNaqvi Год назад

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

@mullfehlfunktion6304 Год назад

Thank you SOO MUCH

@henryclarke9082 Год назад

🤝thank you my friend

@MineHarderYTPS 3 года назад

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

@eliziwazaskal 2 года назад

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

@queenielo1759 2 года назад

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

@Elisa_k424 2 года назад

So helpful

@vnana2991 3 года назад

thank you this is interesting

@qtpigames 2 года назад

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

@bigbunda06t9 Год назад

would've been an anomalous material tbh

@user-qg1oh1xk2d Год назад

رحم الله والديك

@darkspace1350 Год назад

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

@KasraFOo Месяц назад

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

@beckyhiskyas122 4 года назад

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

@unkownbot5601 3 года назад

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

@fistfurious 2 года назад

Thanks

@PandaThatsRed 3 года назад

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

@mnear4521 Год назад

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

@philipbrady9358 6 месяцев назад

easy to understand videos

@desalefentaw8658 4 года назад

clearly explained. Thank you

@444brev 4 года назад

tysm 🙏

@baller42061 2 года назад

Watch out for headcrabs guys, they can hide in very small places

@Tlf1625 11 месяцев назад

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

@LeonSafdarYT 3 года назад

How do i bhop?

@maddyayay4649 Год назад

I love you cognito man

@darnellbailey5038 2 года назад

thank youuu

@nadidshawban2004 2 года назад

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

@coffeepot.softball Год назад

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?

@muhammaddanyal7272 Год назад

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

@sameershah860 2 года назад

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??