A Level Physics Revision: All of Waves (in 28 minutes)

[@JaTheBigKid]

thanks a lot for this you explained what in half an hour what my teacher couldn't in a half term,

[@zhelyo_physics]

Glad this is useful. Thanks a lot for your comment! Got videos like these on A Level topics if they are useful in the future.

[@AshleyNatalieGuta]

😂😂😂😂😂😂😂😂😂😂

[@klo4453]

Literally…….my physics teacher is useless😢

[@HH1-n1x]

Great video very helpful. Just a few corrections, 1. Start of the video, u mistakingly read longitudinal waves as ' perpendicular to the propagation of waves' 2. @ 22:15 , For the refractive index experiment, in the notes it sais ' Place raybox on top of piece of paper', where it shoould be a glass block and raybox should be of the piece off the paper, at an angle so the light hits the glass block .

[@abdulimran1848]

👍🏽

[@rikka6313]

Great video, great channel. I'm learning a lot. Thanks

[@zhelyo_physics]

Great to hear you are learning a lot! Thanks!

[@harshnair9055]

Thank you so much for this video!! It's really helpful

[@zhelyo_physics]

Glad it was helpful!

[@ozone9942]

Amazing revision material, however I just wanted to point out that the thumbnail for the playlist says base units errors and uncertainties rather than all of physics revision so this video was slightly hard to find, thank you for providing these resources!

[@zhelyo_physics]

thanks a lot for the kind comment! Unfortunately playlists have no separate thumbnails and just display the first video of the playlist, which is the first video from the spec. I might change some of the videos around though to make it more visible. Thanks!

[@ptolemycarnell4536]

these are so helpful thank you!!

[@zhelyo_physics]

Glad to hear, thanks!

[@emanqaiser8770]

best video for ALEVELS 😀😀😀

[@zhelyo_physics]

Agreed : )

[@staarren8119]

youre explaining this with the energy of a gamer lol, i like it

[@zhelyo_physics]

haha thanks, I guess like a gaming channel but for physics! : )

[@Smartknight29]

live saving. after watching your content i just wish you the best monitization and revenue from yt u could ever get. thank a ton!

[@zhelyo_physics]

haha thanks for the kind comment! Glad this is helpful!

[@mahamaddahir5193]

Since total internal reflection also occurs in light going from air into a semi-circular block, how do you reconcile this with the n1>n2? 24:20

[@zhelyo_physics]

Total internal reflection cannot happen in this circumstance. (air into a circular block, assuming it is made of a higher refractive index) If n2 is bigger than n1, the sin of the critical angle will be greater than 1.

[@mahamaddahir5193]

@@zhelyo_physics thanks for the clarification and the videos

[@zhelyo_physics]

Anytime!

[@nomandns4694]

at 0:52 you said longitudinal waves travel perpendicular to the direction of energy transfer that's wrong no?

[@zhelyo_physics]

Hi, see previous comments on this, yep, I meant to say parallel. Thanks!

[@polVallverdu-mf9uk]

at 0:48 you meant parallel, not perpendicular!

[@zhelyo_physics]

Yep! I was just checking to see if anyone would spot it : )

[@nawfaljafri]

why'd you turn 4 into 4x10^-3 when finding frequency at 7:26?

[@zhelyo_physics]

The time period is given in miliseconds, here so 4 miliseconds = 4 x 10^(-3)

[@nawfaljafri]

@@zhelyo_physics ohhh, i was sleepy so i thought it said metres seconds and was confused why you converted the metres- ms was mliseocnds that makes more sense now oops THANKYOU!!

[@porridgegod42]

15:35 I thought a filter with vertical chains would absorb vertical light and let horizontal through??

[@devak03]

Will you be going through all of the Waves practicals for OCR. And also the Nuclear and particle physics practicals?

[@zhelyo_physics]

I will do similar videos, yep! : )

[@Pepe_llr]

this helped me so much to revise the exam i have tomorrow 😅😅

[@zhelyo_physics]

fantastic to hear! Good luck in the exam!

[@behradkhodabakhshi5326]

amazing video but i have a question. im doing aqa exam board and i was wondering if you know whether or not we will be examined on the range of wavelengths for the EM waves such as microwaves etc cause i know we will on the visible spectrum so i was just wondering. thank you

[@zhelyo_physics]

I don't see it in the specification exactly (always worth double checking as it's very easy to miss out a point), however I recommend having an idea in case you need to estimate it or to double check an answer. Hope this helps! : ) I'm also currently working on an All of AQA Waves video, coming soon! : )

[@behradkhodabakhshi5326]

@@zhelyo_physics thank you for the response. cant wait for the upcoming video

[@AmL-L-L]

legend thanks🙏

[@zhelyo_physics]

anytime, thank you for the comment!

[@yacchino1005]

on the refractive index experiment , why do we need to calculate an average ?

[@zhelyo_physics]

It is generally recommended for all experiments to reduce errors, rather than trusting single measurements.

[@eaglehawks4337]

Hello Sir! I wanted to ask that what do we do if it asks for phase difference b/w two waves, does your channel cover any of those examples?

[@zhelyo_physics]

Sure the process is exactly the same as two points on one wave. kzbin.info/www/bejne/m6S1qJKHe9-Crq8 Hope this is useful!

[@Cashstack100]

do you have to remember the wavelengths of the EM spectrum?

[@zhelyo_physics]

Yep

[@kausarlolz]

hello sir, do we need to know how to derive intensity is proportional to amplitude^2 and intensity is proportional to frequency^2 or just know the relations

[@zhelyo_physics]

there is no standard derivation for these that we must know. If a show question on something similar appears it will be set within context and with some given equations to manipulate. Hope this helps!

[@kausarlolz]

@@zhelyo_physics perfect thank you!

[@gunjitaswami7743]

hi sir at what angle does the max and min intensity repeat for polarisation?

[@zhelyo_physics]

They alternate every 90 degrees

[@Vihas12]

Great channel 😎

[@zhelyo_physics]

Thank you!

[@mimi_19]

Where did you get the 3.0 x 10^8 ? @18:14

[@zhelyo_physics]

that's the speed of light in a vaccuum, so n=c/v where c is the speed in a vaccum and v the speed of light in a substance

[@mimi_19]

@@zhelyo_physics okay thank you sir

[@kausarlolz]

Hi sir! thank you for this video! just wanted to ask, for OCR A level Physics waves is in paper 2 right? I was doing the June 2018 OCR Physics paper earlier and question 24 had a waves question (young double slit experiment) and i was confused as i thought this was a paper 2/ 3 topic.

[@zhelyo_physics]

yep! OCR waves is in paper 2. In paper 1 though we do have diffraction as in OCR A, it's part of the astrophysics module so dsin(theta) can appear in Paper 1. Hope this helps!

[@userr5296]

Hello sirr for Longitudinal wave you said perpendicular instead of parallel *

[@zhelyo_physics]

Thanks for spotting it!

[@jamiedias]

Do we need to memorise all the wavelengths of the EM spectrum with the corresponding type of wave e.g gamma is 10^-10, X-ray is 10^-7, radio is 10^-1 -> 10^6, or do we just need to understand it exists?

[@zhelyo_physics]

We need to know the wavelength ranges for different parts of the spectrum.

[@luddy20]

what is luminosity? is it power and what's the equation for it

[@zhelyo_physics]

yep total outward radiated power by a star, in Watts

[@OmniversalInsect]

Stefan-Boltzmann law

[@TrishaLsg]

Hello sir, would you mind if i ask what software do you use as whiteboard? 😮

[@zhelyo_physics]

Sure! It's a free software called Microsoft Whiteboard

[@TrishaLsg]

@@zhelyo_physics great! Thank you so much 😭✨

[@intisharalammisbahul9927]

Also, Amplitude square follows inverse square distance proportionality

[@hajerahumar2750]

26:01 bookmark

[@zhelyo_physics]

Good luck revising!

[@jonathoncornly7779]

How would you convert the amplitude in Volts to metres?

[@zhelyo_physics]

I imagine you mean in an oscilloscope? Each square has a length of cm and the oscilloscope setting gives you how many volts/cm there are, you just multiply it by the length of the amplitude in cm.

[@orangut4ng]

When is waves 2

[@zhelyo_physics]

Out already, there are links to part 2 and part 3 in the description. Btw, here are all my revision videos: kzbin.info/aero/PLSygKZqfTjPC3hJ7nRSnnXTw3tI_o67dR

[@orangut4ng]

@@zhelyo_physics thank you

[@bigimaginations9973]

Is there a longer video on diffraction?

[@zhelyo_physics]

kzbin.info/www/bejne/Y53an6CoqNp8a8k there is! : )

[@bigimaginations9973]

​@@zhelyo_physics thanks

[@miracleobeng401]

what spec are you teaching please?

[@zhelyo_physics]

Hi, I teach OCR A, most of the topics are similar across the different ones though. Check with your syllabus : )

[@miracleobeng401]

@@zhelyo_physics Thank you! this is the spec I am doing and your videos have been very useful for me

[@lawrencem8022]

What application do you use for your drawings and notes?

[@zhelyo_physics]

Just microsoft whiteboard, nice, simple and free.

[@lawrencem8022]

@@zhelyo_physics thanks, how do you get the circles to auto connect ?

[@zhelyo_physics]

if you click on settings, there is the option to "enhance inked shapes" that automatically turns things into circles, rectangles, etc.

[@tejinderkaur6497]

Hi sir I have my physics exam in 2 days so can you help me with giving some good advise for physics As level CAIE

[@zhelyo_physics]

Check out my advise here: kzbin.info/www/bejne/fGbMfnqIrN-IhK8 Good luck!

[@vinethkawmududesilva3662]

well explained

[@zhelyo_physics]

thank you for the comment, glad to hear!

[@milazarjeysun5187]

Area of sphere is 4πr²? I thought is was πr²

[@zhelyo_physics]

Nope πr² is the area of a circle. Hope this helps!

[@milazarjeysun5187]

Yeah!i google it and i saw thnk u sir. By the way,did your videos are for 9702 syllabus too?

[@tayyibjamil8573]

Where is all of waves rest of the parts sir?

[@zhelyo_physics]

kzbin.info/aero/PLSygKZqfTjPC3hJ7nRSnnXTw3tI_o67dR they are all in this playlist, in order.

[@OmarFaruk-pf3kc]

Does this covers edexcel a levels spec ?

[@ahnafabrar8490]

Kire bro ki khobor

[@OmarFaruk-pf3kc]

@@ahnafabrar8490 eito bhalo alhamdulillah

[@despacito2]

Did you cover Doppler Shift of Sound?

[@zhelyo_physics]

right here: kzbin.info/www/bejne/iaLWXpeNf6dlebM

[@sultanahmed1971]

Thank you

[@secretspider-man7745]

wowwwwwwwwwwwwwwwwwwwwwwww amazing style easy learning

[@zhelyo_physics]

Fantastic to hear, thank you for the comment!

[@shadowdragon1892]

When talking about phase difference don’t you have to describe the difference of two waves? Or can you just talk about “how out of sync two points on A wave is”

[@zhelyo_physics]

in the last couple of years How out of sync two points on a wave are has been accepted on the mark schemes (at least in OCR A ) Hope this helps!

[@fathiafarhat2152]

Is this video appropriate for As too?

[@zhelyo_physics]

Absolutely

[@ritwikgossain]

I have my exam in 12 days, why am i watching this so late 😢

[@zhelyo_physics]

12 days is not that little if you structure your time well. Drop a comment if something doesn't make sense!

[@ritwikgossain]

@@zhelyo_physicsi have to study for physics, chemistry, maths, pure and stats both, then computer science then practical work. Lol im happy that this is only mocks

[@Anyting9OnTopGrrr]

Why is the mic quality so bad

[@zhelyo_physics]

all fixed now, check out my later videos : )

[@Shubham5068-y7z]

Very bad