If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it'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
Cognito - i have a question about your website if you have your time free - how can you change your course - for example from combined science to separate science?
how is short half life good tho?eg if it has a half life of 1 day ,then it was emit radiation for one day and after that ,it will emit for another one day ?Or do you remove the radiation after it has been one day ? pls reply
A short half-life is good for medical tracers because it means that the amount of radiation being emitted into your body reduces rapidly, reducing the risk of damage to your cells. If a radioactive isotope has a half-life of 1 day it means that the amount of radiation being emitted by the isotope halves every day. For example if a source of radiation was emitting 1000 particles per second and it had a half-life of 1 day, it would mean that it would be emitting 500 particles per second once 24 hours had passed. If another day passed, it would be emitting around 250 particles per second and it would continue halving for every day that passed.
![[Part 1] รักมาไม่ทันตั้งตัว❤ หนุ่มสาวโสดถูกจับมาแต่งงานกันกะทันหัน แถมเธอยังเป็นหัวหน้าของเขา?!](http://i.ytimg.com/vi/y2pOOMkuFI0/mqdefault.jpg)
If you’d like to practise the material covered in this video, check out our platform at www.cognitoedu.org - it'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
Cognito - i have a question about your website if you have your time free - how can you change your course - for example from combined science to separate science?
I was stressing before this but like within the first 30 second I understand everything. I like how you say what course it’s relevant to as well.
I think I have watched over 100hrs of videos because of revising on your channel
video was great recommend, my teacher thought I was cheating because of how good it was
LOL
nah
No phones in class
Thank you so much! I hope to work with this in the future... I want to help people
short half-life means higher activity, the idea is to balance the dose and the activity/half-life so that it will just be measurable when you need it.
Thank You!
💛
i just started learning this, thank you so much!
Are there any specific uses of radioactivity we must know? physics gcse (atomic structure, paper 1, topic4)
They've asked questions about smoke detectors/alarms before
@@dedbread1134 yep, my teachers repeat over and over
These video really help me, specially after my grandma died. They really calm me down
how does this calm you down
@@tokyo6550 he has a soothing voice
woah i also learnt soo much from this video to!!!!!!
Thanks for making useful videos
how is short half life good tho?eg if it has a half life of 1 day ,then it was emit radiation for one day and after that ,it will emit for another one day ?Or do you remove the radiation after it has been one day ? pls reply
A short half-life is good for medical tracers because it means that the amount of radiation being emitted into your body reduces rapidly, reducing the risk of damage to your cells. If a radioactive isotope has a half-life of 1 day it means that the amount of radiation being emitted by the isotope halves every day. For example if a source of radiation was emitting 1000 particles per second and it had a half-life of 1 day, it would mean that it would be emitting 500 particles per second once 24 hours had passed. If another day passed, it would be emitting around 250 particles per second and it would continue halving for every day that passed.
@@ChickenBurger thank you!
I thought this is osmosis video 🤣🤣 nice video thanks
my science teacher brought me here lol
Great video excellent so informing from shush burger
Can I have the PowerPoint of this video... ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️
Thanks
Baraco Barma
I love you
Bah alors on fait la physique ?
who came here from mr roberts
Me
2024?
Today is the day
So we tryna kill cancer cell but in risk of getting cancer
Has
Thank you very much for making the topics understandable and time saver...🤌✨