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 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 :)
@@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
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
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 👍💞
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
@@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.
@@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.
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
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! 🤙
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
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
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.
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!
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.
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
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
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!
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!
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!!!
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
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
@@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.
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?
If anyone is wondering, the formula for calculating half life is c * 0.5^t c is the original amount (here 3000000) t is the amount of half lives (here 3) An you get the amount after 3 half lives You're welcome 🙂
Hi everyone, Could you please help me with this following question Radioactive materials are considered to be relatively safe when their activity has fallen below 0.1% of their initial value. (a) How much half-lives does this take? (Answer = 10 half-lives) (b) Plutonium-239 is a by product of nuclear reactors. Its half-life is 24 000 years. How long does the plutonium-239 have to be stored as nuclear waste before it is considered safe to handle? (Answer - 240 000 years)
Ain't no way I learnt this chapter in 6 mins by watching this vid when my teacher has been teaching me for months alr and I still don't understand what they're talking about 💀💀
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??
this guy taught me more in 6 minutes than my physics teacher can in a week
*ever
@@AS-rq6tr aha tru :))
My physics teacher is shit
im sure you didnt learn how to make gravity gun from ur physic teacher
fr fr ;)
its gotten to a point where people need to specify which half life they're talking about
@@dauzlee2827 YES HAHAHA!!!! WHICH ONE IS HE TALKING ABOUT!!!!???????
Like the game
That’s a good thing
Noice one
@R_of_L Productions frrrr
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 :) )
hope it went okay! i have mine in the afternoon 🥴🥴
@@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 :)
@@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
@@freyaa1200 thank you! good luck and have a lovely weekend too :)
@@isabellaaslam9372 tyyyy xx
Alright, this guy is too underrated!! Push him to the top please, he deserves it!
yeaaa
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
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 👍💞
Where’s the funny screaming scientists and silly Star Wars lookin aliens?
i was looking for a physics analysis from the *game* "Half-Life", but science is cool
Gordon doesn't need to hear all this, he's a highly trained professional
Gordon doesn’t need to hear all this. He’s a highly trained professional!
honestly these videos are a lifesaver. And thats the biggest understatement!! Love your channel
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
Rise and shine, Mr Freeman.
Not that I wish to imply you have been sleeping on the job
@@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.
@@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.
@@MD-dw5eeI didn't see you get on
gordon freeman is a highly trained professional!
He doesn't need to hear all this!
Personally, I prefer the game.
Ye
Which one
I knew someone would say this 😂
i kept thinking this during physics lmao
Half-life Alyx on top 🔥🔥
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
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! 🤙
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
Aha thanks Lily - really happy it made sense to you!
@@Cognitoedu agree
Same here
@@lil_thiccpeach9067 what major are you doing
i’m so proud of you!!!
teaching myself chem bio and physics so thank you for explaining everything - I’ve recommended u to basically everyone Ik
Ah thank you! Glad you've found the channel helpful
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
Glad it's helping Rorie!
@@Cognitoedu weird name isn't it
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.
Rise and shine Mr. Freeman... Rise and shine...
Gordon doesn’t need to hear all of this, he’s a highly trained professional - half life game scientist
Who's Gordon?
@@meenakshibhat6713 he’s from a video game called half life
Oh
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!
Youre videos are SOO helpful, i have no idea how u're not on a million subs yet. Keep up the good work 😉
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.
My bro this is physics
@@sheehhdjejddj2730 its also bio if your doing medicine i think
Rise and shine, Mister Freeman, rise and.. shine..
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
good luck i wish you all the best!
Hope your exams went well!
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
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!
"Silly Valve, It's not 'One, two, Alyx.' it's one, two, thirty-five!"
Ha! Funny
someone get this King his crown
All i can image is a scientist escaping a facility called black mesa
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!
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!!!
where’s gordon freeman
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
i see where the half life decay dlc got its name from
Thanks !!!!!! I liked the explanation and graphs :)
this video just made half life surprisingly uncomplicated for me
You're literally the best teacher I have. Love your videos :)
Thanks Noah, really appreciate it 😊
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
rise and shine, mr freeman, rise and shine....
wait... this isnt half life 1 walkthrough (No commentry) :(
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!
This is the only channel that I've actually turned on the notifications of!! Just understood this topic after my physics lesson this week!
BRO THE THING I COULDNT LEARN FOR MONTHS THIS GUY JUST TAUGHT ME THIS IN 5 MINS
How does the gravity gun work
I always hear half life and I have no clue what it meant, this actually helps, Thank you so much! :D
People are probably referring to the game
"where headcrab?" - some kid
bro wow i have an test tomorrow on this so thanks a lot
I finally understand how to calculate half line on a graph ,thank you
for the last question u can just do 3,000,000 divide by 40 multiplied by 5 for a shorter method
This really helped man god bless you fr
You’re welcome, good luck with all your work :)
doctor freeeeemaaaan
GOOD LUCK FOR 2023 EXAMSSS
love your content man keep this up :D
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.
Thank you so much! Really helped to understand :))
You are amazing, I finally understand this properly now.
Aha that’s greats to hear! Thanks for your support and good luck with all your work!
Seriously helpful, thank you
sheesh this is very helpful thank you
Great video! I actually calculated the answer correctly at the end to my surprise. I ❤️ science!
same!
@@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.
3:09 those isotopes are REALLY distracting, it held my focus for a long time.
Great video though, helped alot :D
Omg thank you. You explained it much better than my physics teacher. Life saver!
if it weren't for this video my GCSE score would've resulted in unforeseen consequences
would've been an anomalous material tbh
Thank you very much for the excellent explanation.
So helpful
Very helpful and easy to learn!
NO! STAY BACK! GORDOONNN..... DAAAAAAAAAAAHHHH!
Who's Gordon?
@@meenakshibhat6713 Gordon freeman
Where's the 3 half life coming from in the question??
5 days x 24 hours =120 hours
40 hrs=1 half-life
number of half-lifes= 120/40= 3 half-lifes
Thank you for the clear explanation. How do we calculate when the decay constant is given?
this videos are so brilliant and clear - so easy to understand! deserve so many more subscribers, these videos are such a help.
Hey thanks for such a kind comment! Really happy to hear you’re finding them useful 🙌
🤝thank you my friend
I never thought i would use cognito for things other than... you know... (nope you naughty naughty) eductaional purpose. Thank you Cognito so much.
رحم الله والديك
thank you
What an awesome video
With perfect explanation
Thank you.
Nice work😎
Thank you so much 👏
How do you calculate a half life? Also thanks this video was very helpful!!
Becky Hiskyas Just look at the graph and find the time taken for half the nuclei to decay.
great videos! you presented everything in such a digestible way. thanks alot
Thank you SOO MUCH
Watch out for headcrabs guys, they can hide in very small places
easy to understand videos
I love you cognito man
He is amazing brahh!!
Thank you , super clear
Could you make videos on astrophysics , electricity &waves (physics igcse)
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?
If anyone is wondering, the formula for calculating half life is
c * 0.5^t
c is the original amount (here 3000000)
t is the amount of half lives (here 3)
An you get the amount after 3 half lives
You're welcome 🙂
Thanks
Hi everyone,
Could you please help me with this following question
Radioactive materials are considered to be relatively safe when their
activity has fallen below 0.1% of their initial value.
(a) How much half-lives does this take? (Answer = 10 half-lives)
(b) Plutonium-239 is a by product of nuclear reactors. Its half-life is
24 000 years. How long does the plutonium-239 have to be stored as
nuclear waste before it is considered safe to handle? (Answer - 240 000
years)
no wait im sory
im not sorry
rats? i was in a room with rats. rats.
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
͓̽T͓͓͓̽̽̽H͓͓̽̽E͓̽ ͓̽F͓͓̽̽O͓͓̽̽G͓̽ ͓̽I͓͓̽̽S͓̽ ͓̽C͓͓̽̽O͓͓̽̽M͓͓̽̽I͓͓̽̽N͓͓̽̽G͓̽
plz prepare the lesson for tunelling of alpha particle bcz i have a problem in this topic
Thanks for the vid :)
Ain't no way I learnt this chapter in 6 mins by watching this vid when my teacher has been teaching me for months alr and I still don't understand what they're talking about 💀💀
thank you very much :) helped a lot
I was learning this on zoom, didn't understand shit, logged off and came here
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??
thank you this is interesting
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?