GCSE Physics - How Radiation Affects Temperature #72

This video covers:
The idea that objects can absorb and emit energy in the form of radiation, and that this can affect their temperature
What determines which type of radiation is emitted
Wavelength-intensity graphs
How these principles apply to the entire planet to determine the Earths temperature
Exam board specific info:
AQA - Separate/triple science only
IGCSE Edexcel - Not in your course
Edexcel - Separate/triple science only
OCR 21st Century - Separate/triple science only
OCR Gateway - Separate/triple science only
Maths Playlist:
• GCSE Maths (9-1)
GCSE Chemistry playlist:
• GCSE Chemistry - Atoms...
GCSE Biology Playlist:
• Video
GCSE Physics Playlist:
• Video

[@Cognitoedu]

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

[@SleepDeprivedAndTired]

Can we appreciate the hard work they put in the animation and how detailed the output is. Like thank you a lot the channel has helped us so much!

[@Cognitoedu]

Thanks Ash, we really appreciate it!

[@arooj8676]

inshallah your channel will grow as the content is very well explained and attractive:))

[@ashtonmiller1186]

InShaAllah

[@yousufjjk2037]

insha'Allah

[@rahimkadwani9999]

Aameen

[@descize]

Amazing video! No one else explains the emitting and absorbing concept like you do!

[@0Dimac]

Thank you for the video explaining a very strange topic in the GCSE Physics... Nice work Cognito! Although a question for the DfE should be 'why exactly do 16 year old children need to know this?'

[@AlexReads1613]

children should have a well rounded understanding of the world around them and why things work, from science, as seen by maths and the sciences, to politics and our world, as seen through history and geography, while also working on their global understanding, as seen through languages. It could use reform but the core concept of creating a well-informed society should be paramount for one of the greatest nations on earth..

[@olafusiolamide27]

Just discovered your channel and I instantly subscribed

[@belqesali8302]

Same over here!!

[@ivashehu7097]

Amazing vid! Have been watching since you had 50 subs, and haven't regretted subscribing, nor looked back since! Thank you for everything you do, you're helping out so many students across the uk!

[@ims4ra]

i started watching your videos few months ago and they are AMAZING! they helped me understand so many topics better. pls start uploading videos again !!

[@mariokart6118]

Yes that made sense , thanks 😊

[@JezebelO-o]

Amazing video and explanation!

[@Cupcakelover3721xx]

can u do a past paper walkthrough for all sciences

[@Nonresponder01]

So I'm trying to figure out what quantity of radiation of each type would be harmful. If there was a human sized microwave and someone went in, would they die? Technically all of it's wavelengths are weaker even visible light, so it shouldn't be, but since a microwave uses waters polarity to heat something up and we are 70% water... I'd assume a we'd get too hot to survive, right? And I'm assuming fire is pure infrared radiation, and that is obviously dangerous to us. So since there can been too much of those two, can there be too much radio waves and visible light to the point that it becomes dangerous for us?

[@briank592]

yes, the power required would be different per case. and below the uv bandwidth the radiation energy just gets converted to heat. so we would boil or be burnt,, but UV and beyond is so small that it can cause molecular damage i.e. cancer, sunburn etc... If we have a LED of a pure color, and shine it in our eye, above a certain miliwattage level it burns a hole in your retina. And even lower on the spectrum, the military has microwave guns for crowd dispersal and those can boil you alive! I have also herd of lines men getting damaged by working to close to radio towers, but i couldnt tell you the specifics of the damage. prb burns.

[@nishtakasundass6669]

Intensively well explained 😜😜

[@INFINIT3Rxpct]

But... our star is much hotter than a bunsen burner (with a roaring blue flame) yet it is still not hot enough to be blue? Shouldn't our sun be blue instead of white?

[@INFINIT3Rxpct]

Because a star's surface must be 10 000K - 50 000K to be a blue star, and our Sun has a surface temp of 5800 K (roughly).... so it is not a blue star. How is a bunsen burner flame blue then? It is only 970K. Is it because of the mass?

[@foryou-ft8vf]

What do you think I.R. would look like if we could see it? I wonder if you could see Infrared radiation coming off of "room temperature" objects, what would that look like. Would it look like steam coming off of most things (as most things would be at room temperature)? Maybe that question can not be answered. Thank you for this video, helped me a lot to understand what we can see and not see of radiation and in respect to temperature.

[@الاميرةهايديمنالسعودية]

This is very helpful

[@hamatiehomer1102]

Then why is the sun not blue then

[@danielxoxo.]

@@hamatiehomer1102 this is actually a very good question though xD.

[@I_Review04]

Thank You for the video! BUT, for GCSE do you have to know the graph of intensity and wavelength???

[@henouioui5322]

I don't think so. Well, it was a rough representation so memorizing the graph is something that you shouldn't do unless you want to.

[@neney6197]

@@henouioui5322 woa oreki

[@henouioui5322]

@@neney6197 woah

[@DJwldnn]

Nice video

[@lujixcjml]

Thank you againnnnn

[@arooj8676]

very helpful

[@nayanbanik8474]

Very nice 👌

[@nn-uj1iv]

Why is the spectrum shown the wrong way round, Roy G Biv.

[@Cognitoedu]

It can be shown either way round, it depends on what the x-axis is :)

[@nn-uj1iv]

@@Cognitoedu Vib G Yor doesn't quite have the same ring to it.

[@misium]

The color of Bunsen flame goes blue not because of black body radiation. The flame would have to be 10000k to be blue because of that.

[@Ghost-oh1vc]

Sorry but you sound like an AI, like Siri

[@marinKem]

amadeus the ai...