GCSE Physics - Radio Waves #65

[@aimenabbasi2728]

u cover everything. It's really a relief

[@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_4.06. 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

[@lenelene8814]

Hey Cognito, thank you for the videos! I did not understand everything until you uploaded the videos. Really appreciate it! You just got a new subscriber.

[@dat-boi-aden1203]

You save me every time I don't understand a concept in science

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woah my teacher took literally 34 mins to explain this I was asleep while my teacher was teaching lol now I understood this for just 4 mins man you just got a new subscriber your videos are amazing

[@hk4033]

honestly love these vids theyre so organised

[@Cognitoedu]

Thanks h k, glad you like them 👍

[@chosronu8652]

people who disliked got triggered cuz they couldn't see the ultraviolet waves irl

[@xixiex]

Ha 😑

[@3laaag]

LOOOOL

[@oliviaf8276]

Thank you !! I have watched all your videos on waves and now finally understand hahaha

[@corrupted_user258]

i struggled learning this topic until i clicked on this video... So magic is real?

[@Fail-ded]

It is

[@vivek115yahoo8]

such a helpful video - been struggling on this topic for a while thank you for making it so much easier!

[@Cognitoedu]

You’re very welcome - cheers for for the support!

[@abunahiemalbisri347]

Been binge watchin ur vids

[@Cognitoedu]

Aha thank you for the support! Good luck with all your work 🥳

[@azra8300]

Cognito why

[@thetotaldramaking5427]

You are a national treasure.

[@thegarydosesales5043]

My teacher always recommends your videos haha

[@ahmediftekhar345]

Your videos are really helpful to me😁

[@ahmediftekhar345]

Could you please explain to me how radiowaves are made as it did come up in a GCSE exam question last year

[@ahmediftekhar345]

Could you also make a video of conservation of energy and such laws cause i find them really confusing...making a video of them will grately benefit me... Thank you

[@Flora-uq1kj]

Thank you so much! Really useful, and you cover every thing, make my life easier.

[@leonardogoncalvesjacometti4838]

your videos are truly amazing, thank you

[@akjndlkahslkdjalksjd]

Didn't r3ealise a reciever was an orange ice lolly! GREAT VIDEO THOUGH HELPED A LOT

[@georgebaker3016]

This was very helpful with my science work

[@novokid6159]

Very good video; explains a concept of oscillations and producing radiowaves that I struggled to understand before :)

[@azra8300]

No

[@mihikaomseema]

These are so so helpful! You guys deserve atleast million followers!

[@Cognitoedu]

Aw thank you so much, we really appreciate it 🤩

[@Jess-jf9zj]

This was so helpful! Thank you!

[@stustjohn]

That's quite a nice video... apart from the random introduction of "800" 😱 As well as being wrong information, it's also of no practical use whatsoever. Think about it: if I want to transfer a piece of information to you using a radio wave, say, 800 kHz, for example, *you* would need to know what frequency to tune your set to in order to receive my signal. But if you knew that , then the number I had "sent" would not be new information!

[@stustjohn]

Having watched it again, I can see (from your diagram) what you were trying to do, but this does not come across in the script. The problem is, of course, that we don't want to start GCSE students worrying about modulation. I think that your diagram hints at it - somehow you are going to put the 800 Hz wave into/onto (modulate) the higher frequency carrier wave. Then, the person who receives the carrier wave uses their receiver to strip off the added waveform (demodulate) and examine it... This is part of the frustration of much of the modern GCSE Physics syllabus: it gets tantalisingly close to being useful/relevant but then cuts off at the point where it might make some sense! (Compare also the mind-bending use of LDRs to control lamps in potential divider circuits, all because transistors are no longer on the syllabus. There are some crazy ideas appearing in textbooks and revision guides that attempt to make sense of this, rather than accepting we have a point in the circuit where the potential rises and falls according to the light level... which we can utilise with the right device, as long as it draws negligible current.) Sorry, I'll shut up now!

[@rocketfuelwithagun]

@@stustjohnneek

[@stustjohn]

@@rocketfuelwithagun anything helpful to contribute?

[@trino5269]

Hello your videos are awesome but it would be cool to have just the audio on a platform like Spotify so I can listen and do other thing at the same time thanks :)

[@Cognitoedu]

Hey Trinox thanks for the support - nice suggestion and noted :) might be a little while though haha

[@wolfgirl28]

If you have Bluetooth headphones or a speaker you can just play it on YT while you work :) Unless you mean so you can do other things on your device, in which case I’m sorry I’m dumb

[@abelblesson886]

@@wolfgirl28 very smart tbh

[@a51chronos79]

@@abelblesson886 true

[@ahmediftekhar345]

Why do very short waves have to be directly transferred from transmitter to reciever? Why does an object get in tbe way?

[@rhyspounder9199]

1. They have to directly transfer from transmitter to receiver because they don't have much range. 2. An object gets in the way because it loses its strength because it goes A to B meaning it doesn't curve or anything it just goes straight through objects and the stronger insulator it is the more it loses its signal like going through paper wouldn't make a huge difference to most waves apart from ones with very short frequency such as gamma rays but lead will stop pretty much all waves if not bent around.

[@ahmediftekhar345]

@@rhyspounder9199 you are legit a lifesaver

[@ayeshasheraz673]

Why doesn't Cognito have a million subs like they legit deserve it!

[@ImBobtheHampter]

Yes, hedeserve it

[@ImBobtheHampter]

But I think if i can, i will let him have 5 million subscribe

[@gaurangapatel4024]

Cognito, any idea when space and cosmology will be discussed for Edexcel IGCSE and GCSE physics. Hertz-sprung Russell Diagram, Development of Stars etc..

[@nishtakasundass6669]

I started to love waves after watching this.

[@isabelleelliott9167]

couldn’t be me

[@ikalorano]

Thanks for such a lucid video.

[@Ohum32-]

Thanks, as i am a 6th Grader I like to study Physics and this video is very helpful.

[@Cognitoedu]

That's awesome 👍

[@GCSEPhysicsExplained]

Great video! Keep up the content

[@Lucasmain103]

Bro helped me with a science project he is a walking w

[@hydrasjournal]

im gonna sacrifice someone for this cognito guy so he can never struggle again

[@timwhaley8810]

Dude, I was just getting comfortable and ready for action and the video ended. When the radio wave is produced, can you “catch” the radio wave anywhere? That is, in a 360 degree radius? That is to say, anywhere in a sphere surrounding the radio wave source? So is the wave a spherical wave? If so, what happens to the excess energy lost? Thank you!

[@NandanYalla]

Amazing videos... Please keep making so much more content

[@Harib_qb]

nice video man

[@miltoslendo3176]

What is the wavelength of the very short radio waves?

[@CEFKARANKUMARR]

Thank u sir very helpful 🙏

[@udaykabriya6801]

Which exam board do you cover

[@casondave]

NIce, too bad a lot of it is not quite there ..... you'd use s frequency generator not a "scope" to generate the frequency to go out. The oscilloscope is a measurement tool usually.

[@groggers]

a lot of oscilliscopes nowadays have built in signal generators, and yes while I agree it's good to be specific, this level of detail probably isn't required for the exams at GCSE

[@michaelsanchez4867]

colors with shorter wavelength may be dispersed further like the blue color but why it is opposite with the shorter wavelength of radio waves?

[@qd156]

Wow, thank you for video so great!!

[@hak4800]

Good job sir

[@unclefrankindia]

Good summary

[@justyourdude9116]

Thank you brother

[@philipbrady7635]

videos are amazing

[@sanusiayatullah5152]

Thanks a lot. It really help

[@shannonlu5837]

3:03 RAAAAAAH SINGAPORE MENTIONED RAAAAH

[@-ailyanne-7089]

0:29

[@ophiolatreia93]

So are radio waves and photons one and the same? I mean surely photons carry more than visible light?

[@yaxhax9100]

goated

[@ImBobtheHampter]

I watch all your waves video

[@ImBobtheHampter]

It's very useful

[@theoryandapplication7197]

thank you very much

[@tenshikyu.674]

Aren't long waves only up to 100km+? So isn't it not possible for it to travel from london to singapore?

[@ifesjournal]

hi! would it be okay if i screenshotted some points in this video to use as flashcards? your videos are amazing. tysm, God bless x

[@ME0WMERE]

Since you aren't using them for monetary gain, it's probably fine. (Although you're probably past the point where you need an answer.)

[@ifesjournal]

@@ME0WMERE yeah 😭 thank you tho

[@ifesjournal]

@@GottaGrind lol yh i probably did 😭

[@ifesjournal]

@@GottaGrind yhh i finished a levels too

[@jax7561]

Pog very epic

[@chazeegumalas6223]

what app did you use for editing?

[@user-fz2it7rq2s]

Why are radio waves used to detect so much?

[@meganday4325]

is this triple ??

[@Stefan_Dragancev]

Hello, what increases or decreases the transmission power? Voltage or amperage?

[@tretv6190]

Quick I need five facts about radio waves!!!

[@hmrdarkhawk8543]

Wait, dont electromagnetic/light waves travel in straight lines

[@suratunbegum7506]

I am a radio listener.

[@XesaDomingo]

permission to use this for our presentation

[@talkyoursht]

Note he didn’t mention satellite.

[@groggers]

next video

[@happymck4641]

why is the video so slow

[@farah2428]

Put speed up. I watch with 1.75 or 2 times speed

[@calvinmoylan835]

Hello :)

[@saysum2042]

5g.

[@a51chronos79]

6g.

[@username-sb1hp]

👍

[@ImBobtheHampter]

d

[@Skibidiash]

thank god for cognito

[@Skibidiash]

hahaha hes so good

[@Skibidiash]

ikr i acc learn more stuuf from him than my teachers

[@Simon-xi8tb]

sorry, but this video does not explain much

[@ja7406]

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[@ImBobtheHampter]

Why are you crying?

[@lucasgraham7347]

.

[@a51chronos79]

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[@randymccall304]

The earth is flat