Tap to unmute

Single Slit Diffraction is like getting surprised by a text you just sent yourself | Doc Physics

  Рет қаралды 103,077

Doc Schuster

Doc Schuster

Күн бұрын

Пікірлер: 230
@WeAreShowboat
@WeAreShowboat 11 жыл бұрын
Your enthusiasm is contagious. Keep enjoying life. Nicely done!
@kolaparadise260
@kolaparadise260 9 жыл бұрын
you are an incredible teacher voice color explanation and most importantly, fluency, it amazes me that u did that in one single take
@DocSchuster
@DocSchuster 9 жыл бұрын
Peruvian drummer That's really nice of you. I got pretty lucky on that one!
@gregorykarimian3813
@gregorykarimian3813 3 жыл бұрын
You mean in one single “phase” haha, sorry, sorry, ill stop, ill stop
@peanutz23
@peanutz23 11 жыл бұрын
I LOVE YOUR EVIL LAUGH, thank you so much for this video. I do HL IB Physics so this is great!
@DocSchuster
@DocSchuster 11 жыл бұрын
What? That's my HAPPY laugh. You should hear my evil laugh, though...
@blazebluebass
@blazebluebass 11 жыл бұрын
This was perfect! The explanations were totally clear, absolutely nothing I did not understand. And the excitement was fantastic, too. I feel very well prepared for tomorrows period - thank you! = )
@absurdu5t
@absurdu5t 9 жыл бұрын
Thank you so very freaking much. All of your videos are epic.
@jak5869
@jak5869 8 жыл бұрын
Wow your videos are unbelievably better than the crap videos they give me at my university. Thank you so much
@MysticMD
@MysticMD 10 жыл бұрын
The popcorn was good
@777teiubesc
@777teiubesc 11 жыл бұрын
Thanks for deriving the equations- I've found that to be key for understanding physics!
@Dr.Isaacs301
@Dr.Isaacs301 3 жыл бұрын
Mr. Schuster: Are you taking notes? Me: 👀 Also me skipping back to take notes: 😕 🤔
@potatoria
@potatoria 9 жыл бұрын
I love your enthusiasm!
@rehabaljahwari6988
@rehabaljahwari6988 10 жыл бұрын
You are great .... You make physics very very interesting . ThanX Keep going
@azazahamed
@azazahamed 10 жыл бұрын
Love the enthusiasm. He puts fun in Physics more than Sheldon Cooper. :D
@princessrad111
@princessrad111 9 жыл бұрын
7:44 golden moment
@sapphireblue9209
@sapphireblue9209 4 жыл бұрын
6:30 the example made me laugh, thank you. I was not having a good day but this has brightened me :))
@DocSchuster
@DocSchuster 11 жыл бұрын
Well, if one slit is two, then each slit is W/2 wide. Also, those two slits are W/2 apart from each other. So, yes, width is also separation, but neither is equal to the width of the real, physical slit width.
@sweet77creepy
@sweet77creepy 10 жыл бұрын
doc, this is the first video of yours that im watchin, and man , i'll tell ya. this video needs more views. your teaching is a reflection of the passion i have for physics. when the teacher is as excited as the kid, then ...well, its a party :D cheers.
@DocSchuster
@DocSchuster 10 жыл бұрын
Yay! Parties! I'm thrilled to hear that you're exited, too.
@jaydeezy123
@jaydeezy123 8 жыл бұрын
Excellent video. Really helped me a lot. Thanks so much!
@apurupamargapuri4192
@apurupamargapuri4192 6 жыл бұрын
Why divide the slit into powers of two? Why can't we split in into 3 parts or nine parts etc?
@lamudri
@lamudri 11 жыл бұрын
Why does the slit have to be divided into powers of 2? Don't any multiples of 2 work as well?
@tomasdanco2779
@tomasdanco2779 9 жыл бұрын
"It's like you're in a conversation with yourself, and get interfered by a text that you sent your self" Love it! Thanks for bringing the humor to physics =)
@Aa-fk8jg
@Aa-fk8jg 4 жыл бұрын
Thank you so much Doc!! You’re amazing
@jamesvlasis3817
@jamesvlasis3817 3 жыл бұрын
I can't believe Benson went back to school to get a physics degree
@LukeR1759
@LukeR1759 10 жыл бұрын
Well, my brain is now non existent!
@DocSchuster
@DocSchuster 11 жыл бұрын
Thanks! Happy to help.
@yashen12345
@yashen12345 11 жыл бұрын
"thats a dark fringe yo!" I LOVE THIS PLZ DONT STAHHHHHPPP EVER
@cram9780
@cram9780 7 жыл бұрын
single slit diffraction made me want to to cry
@marutinandan9359
@marutinandan9359 10 жыл бұрын
u r a beaut teacher doc!!
@Shumayal
@Shumayal 11 жыл бұрын
Please come and teach at my college. I love you, wished my professors had the same enthusiasm like you.
@DocSchuster
@DocSchuster 11 жыл бұрын
I'd love to, but I probably shouldn't. Thanks for the invitation, though!
@goodboi7665
@goodboi7665 4 жыл бұрын
ARE YOU NINJA
@mattheoswho1010
@mattheoswho1010 6 жыл бұрын
But what about the interference of rays from all the other positions on the two halves of the slit, that are not at a distance of W/2? I don't get it. You can form infinite pairs of rays from the two halves, but we just consider the ones who are at a distance of exactly W/2 (which are also an infinite number of pairs don't get me wrong). What is going on here? What am I getting wrong?
@misssweethearted
@misssweethearted 9 жыл бұрын
awww I like the cute little Newton doll at the beginning I want it. hah
@emadrio
@emadrio 11 жыл бұрын
you are now my most favorite person
@_Nitrous_
@_Nitrous_ 8 ай бұрын
It's too chaotic for me.. i feel more confused then i was before 😅
@m.hamzaramay6599
@m.hamzaramay6599 8 жыл бұрын
Diffraction is prominent when wavelength of light is large as compared to the object (small ball for example).In the slit experiment we say that if slit is small then there will be more prominent diffraction ,isn't the distance between the slits acts as a object here ?
@Zerpentile93
@Zerpentile93 11 жыл бұрын
Thanks for the help. I wish I was as interested as you in physics. I never do this when I study 12:12.
@captainaddy9591
@captainaddy9591 2 жыл бұрын
The way he said “goodbye”
@DocSchuster
@DocSchuster 11 жыл бұрын
Thanks! I should really look these things up before I start, right?!?
@JH-qk8tj
@JH-qk8tj 7 жыл бұрын
How do rays of light moving parallel to each other, and starting at different origins, ever meet on a screen and interfere? 8:05
@junhaong9268
@junhaong9268 4 жыл бұрын
So essentially single slit diffraction proves that parallel line do intersect eventually...woah
@Blooby1234
@Blooby1234 9 жыл бұрын
Why does is split in half and not in another quantity, such as 3 or 5?
@DocSchuster
@DocSchuster 9 жыл бұрын
+Julia Zorthian Try the maff of that split and see what it looks like. I think it would work!
@Kelvo980908
@Kelvo980908 8 жыл бұрын
+not anyone I've been wondering why the whole night! still no answer...
@grethnueva3413
@grethnueva3413 4 жыл бұрын
I loved this lecture.
@ayadimishra
@ayadimishra 7 жыл бұрын
I wish my class were this fun...Thank youfor this!!
@05032885741
@05032885741 9 жыл бұрын
REALLLYYYYY HELPFULLLL , THANK YOU !!
@UH60_PILOT
@UH60_PILOT 9 жыл бұрын
Thank you so much! even though Im not good at English, I can understand from your drawings. really good and easy explanation.
@kharicky
@kharicky 6 жыл бұрын
Nothing weird just that light is not a particle. It bends on the walls of slit.
@zar1802
@zar1802 6 жыл бұрын
Geez... but I seriously am sitting here eating popcorn and not taking notes!
@aaryanoberoi22
@aaryanoberoi22 9 жыл бұрын
You are amazing!:D
@Matixcubix
@Matixcubix 10 жыл бұрын
How are the bright fringes defined in the single slit diffraction?
@myprettygirl91
@myprettygirl91 6 жыл бұрын
this is hilarious, thanks for the laughs :))
@refilwesenosha4468
@refilwesenosha4468 10 жыл бұрын
love how you put fun into your teaching.....i like the "fix you bow tie newton" line.....killed me
@gentleben590
@gentleben590 11 жыл бұрын
I see what you're doing and I like it.
@sunke88
@sunke88 11 жыл бұрын
is this how cinema theaters work?
@Arhazobooks
@Arhazobooks 8 жыл бұрын
I love your enthusiasm when teaching. Really kept me listening with having to struggle to concentrate. I just have a question though, what's the point of treating the single slit as multiple slits? Is it just to get a better equation to use when calculating bright fringe width?
@harryburiram
@harryburiram 11 жыл бұрын
love your videos!
@sachinrath123
@sachinrath123 6 жыл бұрын
seems when there is destructive interference we l get a dark spot and in constructive one bright spots with less intensity,so bright fringes,how are dark fringes ? are they having less darkness or less brightness.
@sarahbiebah
@sarahbiebah 8 жыл бұрын
Why couldn't we have done the same calculations for the bright spot? Or, let me guess, there are different ranges of bright rather than the one completely dead spot (dark) so we need more complex calculations to calculate it's position?
@kajaldahiya8775
@kajaldahiya8775 8 жыл бұрын
I never enjoyed physics that much that I did today
@MrArteriole
@MrArteriole 10 жыл бұрын
Hey man! Incredible video, first one of yours I've watched as I've been desperately searching for solid info on single and double slit light wave experiments. Tis people such as your self who have inspired me to go on to want to do much the same thing and teach physics at high school or university. The only things I don't seem to understand with all of this is; 1. If Huygen's principle says there's infinite points along a wave front from which 'secondary wave-lets' can exist, then why isn't there simply infinite interference? I don't see how the interference pattern can exist from this viewpoint. (I think someone asked this earlier, but I thought you may know now?). 2. At about point 8.20 in the video where by you talk about these two points from which light rays come out from, you say they're both projected with the same angle theta, but then interfere with each other a relatively large distance away. How would this work if they're projected on the same angle, and are therefore parallel? Unless by them being half a phase out means they're pathways change and meet later on? Cheers :)
@DocSchuster
@DocSchuster 10 жыл бұрын
1) Very puzzling concept! Unless there is some impediment (a wall or slit, perhaps), there IS infinite interference. The slit allows only some of the new wavelets to exist, which is the whole reason that light is seen at all above and below our slit. You'll have to also agree that the slit is a very large number of very small slits all sitting on top of each other. That allows me the treatment I've made. 2) The rays are of course not perfectly parallel, but are VERY NEARLY parallel since the screen is, as you say, a long way away. That distance allows them to be [almost] parallel and finally to meet. Of course, parallel rays would only meet if the screen were infinitely far from the slit, but it would take too long to put it there. (and then, how would you get it back?!?)
@MrArteriole
@MrArteriole 10 жыл бұрын
Doc Schuster I see. I guess trying to fully understand how things such as this work is pretty difficult as were only working with models, not reality. Although with Huygen's principle, if spherical waves propagate from all points along the wavefront etc etc, then wouldn't an interference pattern be able to exist on the LHS of the slit, as well as the RHS? It would make sense that there would be to much disturbance behind the slit with incoming waves, but if just one wave were to be sent, then once the wave hits the slit, the wavelets would propagate in all directions from all points along the wave, and so create an interference pattern on both sides of the slit? I understand its a 'forward' moving wave and all, but its almost as though semi-spherical waves propagate from each point, just on the RHS of the point of origin. This could then be seen to make more sense for an interference pattern only occurring on the RHS of the slit? Its all pretty nuts
@pikan_golman
@pikan_golman 5 жыл бұрын
im here sipping my lemonade and getting hyped as hell
@MysticMD
@MysticMD 10 жыл бұрын
When you "separate" the slit into 4, do the rays converge to a single point on the screen?!? And it represents a single dark spot?
@shresthabijay26
@shresthabijay26 8 жыл бұрын
i like your funny style.. Nice work
@ella5024
@ella5024 6 жыл бұрын
That's a dark fringe, yo?
@cram9780
@cram9780 7 жыл бұрын
if we assume that maxima are found at odd half integers of lambda, for example ø = 3Lambda/2a you can create that maxima by splitting a slit into three slits, slits 1, 2, and 3. so all the waves from 1 interfere destructively with the waves in 2, and only 3 contributes to the maxima at that point. if you have 5 slits, 1 kills 3, 2 kills 4, and only 5 contributes to the maxima, thus ø =5lambda/2a. does that make any sense?
@DocSchuster
@DocSchuster 11 жыл бұрын
In my derivation, I can't have six or ten slits, etc. My simple argument never considers that a single slit be seen as three slits. I guess you'd have to draw TWO red dots on it and see what happens. Good luck!
@ethann-n3007
@ethann-n3007 4 жыл бұрын
What causes the bright fringes in between the integers of m
@shivambhatyar
@shivambhatyar 7 жыл бұрын
Come on Newton fix your bow tie XD
@Jcozzer
@Jcozzer 7 жыл бұрын
Where do the dots come from though?
@zungnguyen5300
@zungnguyen5300 6 жыл бұрын
why W/2 but not W or W/3 or whatever it is?
@donegal79
@donegal79 5 жыл бұрын
w or w/3 or w/5 are all fine......take w/3.....divide slit into thirds....call points between slits s1 and s2 A B and C.....if path difference between s1 and A is lamda/2 then all points between s1 and B destructively interfere (s1 cancels A, points between s1 and A destroy successive points between A and B....leaving one -third of points, those between B and C to all more or less combine to give a subsidiary maximum at that angle. Geometry says that w/3(Sin theta) = lambda/2...so first subsidiary max occurs at w Sin theta = 3lambda/2. Similar arguments work for w/5 etc etc
@larsgeluk8380
@larsgeluk8380 6 жыл бұрын
What about the bright points
@gurulinggbiradar6982
@gurulinggbiradar6982 4 жыл бұрын
i have a question .if the wavelength of light is very small,then even a very small distance matters right.then how can we assume parallel rays when we know there will be some extra path difference right and it could be comparable to lights wavelength.
@jnxmaster
@jnxmaster 11 жыл бұрын
Great vid! Keep it up!
@mgallegoballester
@mgallegoballester 10 жыл бұрын
Hi Doctor, I have another question for you I suppose that you're dividing the slit into any number of slits, as many as you want, because of Huygens' principle. But you're only taking rays that are at a distance equal to the width divided by a natural number (w/n) to calculate dark fringes in their intersections (interference), at infinite. So you take two rays separated w/2 to calculate the first dark fringe; two rays separated w/4 to calculate the second dark fringe; and so on. The problem I find is: if you just move a little closer one ray to the other after having calculated the first dark fringe, then these two new rays will interfere destructivly just a little higher in the screen, producing a new dark fringe a little higher (the angle theta will not be very much increased). That would produce a totally dark screen, or maybe totally bright. Where is my mistake? It's hard to explain without a picture, and I know it may be hard for you to understand it too, but I hope you will. Thank you very much
@mahmoudm451
@mahmoudm451 10 жыл бұрын
by putting that dot, wouldn't it make it double slit again??
@DocSchuster
@DocSchuster 10 жыл бұрын
I just put the dot there IN MY MIND. Surely you wouldn't argue that my decision to imagine a dot there affects our results...would you?!?
@mahmoudm451
@mahmoudm451 10 жыл бұрын
Oh okay sorry but you din't mention that in the video :) thnx alot for all your videos, they are really helpfull!
@DocSchuster
@DocSchuster 10 жыл бұрын
I should note that. Thanks for the tip!
@gjkings
@gjkings 7 жыл бұрын
what would the pattern on the screen look like if you shoot a single photon one by one in a single slit experiment?
@jukainn
@jukainn 9 жыл бұрын
I am eating popcorn right now
@ilovecartoonslol
@ilovecartoonslol 8 жыл бұрын
Same!
@eyesofphysics97
@eyesofphysics97 10 жыл бұрын
Oke, so why did you make the light at 8:05 go upwards? Why would it not go straight? What makes light randomly turn theta degrees upwards if it is in the middle and is unaffected by diffraction?
@DocSchuster
@DocSchuster 10 жыл бұрын
Oh, it's a point source, so the light does go straight up also. See my video on Huygens' principle!
@eyesofphysics97
@eyesofphysics97 10 жыл бұрын
AH! I got it. Thanks, and your videos are awesome!
@DocSchuster
@DocSchuster 10 жыл бұрын
Happy to help. Good question, BTW. Never blindly trust authority.
@eyesofphysics97
@eyesofphysics97 10 жыл бұрын
Exactly, most of my teachers just say that this is how it is because of the equation. Only my physics teacher can answer my questions, but in a roundabout way. I feel like knowing something w/o understanding is almost equivalent to not knowing at all.
@johnpincamera2967
@johnpincamera2967 10 жыл бұрын
how do you know that the second ray that is interfering is in the middle of the hole?
@kamilahkent64
@kamilahkent64 7 жыл бұрын
thank you for this!
@anagr93
@anagr93 9 жыл бұрын
OH MY GOD THANK YOU SO MUCH SIR!
@Chirag1496
@Chirag1496 11 жыл бұрын
Very good. btw, whole no. include zero @15:16
@nathanzhao4903
@nathanzhao4903 7 жыл бұрын
Why is when the distance between two rays w/4, the difference in wavelength is still 1/2? Shouldn't it be 1/4?
@a.syndeed
@a.syndeed 3 жыл бұрын
The number of zones you divide the slit into doesn't necessarily have to be a power of 2. It seems to me any even number would do the trick...
@haroonmuhammad979
@haroonmuhammad979 8 жыл бұрын
dear sir Doc Schuster. one thing that is really confusing me about diffraction is that how can more than one wave enter the slit when the slit size is comparable to the incoming wave
@DocSchuster
@DocSchuster 8 жыл бұрын
+haroon muhammad Good question. The wavelength is approximately horizontal, and so independent of the vertical slit. The amplitude of the wave does not matter for diffraction (even low amplitudes that fit will interfere).
@Abdiga_
@Abdiga_ 10 жыл бұрын
I see that you're using the small angle approximation for the single slit so when can you not assume that the angle is very small? Thank you
@DocSchuster
@DocSchuster 10 жыл бұрын
That depends only on how correct you want to be! If you're happy with an error of 1%, calculate the difference between the (messier) true relationship and the SAP, set it equal to your 1% error, and solve for angle!
@leisryan
@leisryan 10 жыл бұрын
Doc Schuster This just debunked QM mystery fanatics in their faces...! Simple but GENIUS...! Modern QM mystery advocates should go back to College and master Elementary Wave Theory..! instead...!
@waddles9282
@waddles9282 7 жыл бұрын
How do the rays interfere when they're parallel to each other? (At 8:04) I'm probably just being stupid but I just don't get it :)
@AurelienCarnoy
@AurelienCarnoy 3 жыл бұрын
Excellent, but what about one photon at a time? Any one? Wgat a great teacher
@dhananjaypatel4065
@dhananjaypatel4065 11 жыл бұрын
i was asking about condition and theory proof of bright fringes.........like u hv shown for dark fringes in this video.......................please reply
@dhananjaypatel4065
@dhananjaypatel4065 11 жыл бұрын
but what about bright fringes?
@DocSchuster
@DocSchuster 11 жыл бұрын
In between the dark ones. The energy of the wave must be conserved, so the bright spots get brighter and the waves cancel at the dark fringes.
@weiv6229
@weiv6229 3 жыл бұрын
i love the title
@massivejester
@massivejester 10 жыл бұрын
Thank you for this video! :) Subscribing
@DocSchuster
@DocSchuster 10 жыл бұрын
Welcome, friend.
@aaryanoberoi22
@aaryanoberoi22 9 жыл бұрын
And that's supposed to be Natural number set!!
@ramanaathuraisingam8170
@ramanaathuraisingam8170 10 жыл бұрын
If you said that any natural number of wavelengths can equal wsin theta. How did you get -1 wavelengths
@Emzo99
@Emzo99 9 жыл бұрын
But he did stick needles in his eyes, so that's cool hahaha
@raouf31
@raouf31 9 жыл бұрын
Doc Schuster Damn ur lucky
@Chirag1496
@Chirag1496 11 жыл бұрын
double slit exp gives different intensities at different points??? (the initial part of the video)
@ALFPAJARITO
@ALFPAJARITO 8 жыл бұрын
Dear Doc: The doublé slit system has its own interference pattern, but each slit also has it´s own interference pattern. So, in the doublé slit experiment we have 3 interferences mixed right? (that is, slit 1 interefence + slit 2 interference + slits 1 and 2 interference). What is the final interference pattern for the doublé slit takeing in count the 3 interferences mixed together?
@DocSchuster
@DocSchuster 8 жыл бұрын
+Alfpajarito Wow, yes. I have spent some time looking at these patterns and forming them on my retinas, so I can assure you that the double-slit pattern strongly dominates when there are two slits. However, as the two slits each get narrower, the single-slit behavior becomes noticeable. Ultimately, the single-slit diffraction pattern is what causes diffraction-limited optics.
@ALFPAJARITO
@ALFPAJARITO 8 жыл бұрын
+Doc Schuster Thank you very much for your fast reply. I´m ahppy and surpised you was able to understoond my question because my poor english. Regarding your answer: I was trying to get interference patterns with a green laser I own, both single and doublé slit and I wasn´t able to notice the diference between them. Both patterns seems to be the same intensity, don´t konow may be I´m doing something wrong... But if both kind of patterns has the same intensity why one will dominate over the other?... What I´m missing???
@DocSchuster
@DocSchuster 8 жыл бұрын
+Alfpajarito Focus on the central peak - is it twice as broad as every other peak or not. The broadening of the central peak is the only distinction between the two.
@10Anindita10
@10Anindita10 11 жыл бұрын
Hi, I read somewhere that bigger satellite dishes diffract waves less, which causes the waves to be reflected onto a smaller focus. I'm not really sure what diffraction has to do with satellite dishes - does the dish behave like a single slit?
@DocSchuster
@DocSchuster 11 жыл бұрын
Great question. Watch on, 'cuz my video is called Doc Physics - Psst...Hey kids...There's a bright spot in the middle of circular shadows. Really.
@chinmayshah4790
@chinmayshah4790 9 жыл бұрын
Doc Schuster 0 is part of whole no at 15:21 sec
@OnufrievS
@OnufrievS 5 жыл бұрын
It's okay because it will still give you a dark screen xD
@aayushnahata92
@aayushnahata92 11 жыл бұрын
now,considering 1 slit as 2 here, the distance between the two slits is supposed to be d.Then why are u taking it as half the slits.why is not the distance just the point?
@pokerater4463
@pokerater4463 8 жыл бұрын
amazing.......thnks u really are my teacher.......:) love from me
@danwilloughby728
@danwilloughby728 8 жыл бұрын
Do you still get interference when the wavelength is exactly the same length as the slit (W)? Huygens explanation states each source will produce wavelets that interact, but if there is only room for one 'wavelet' then how does interference occur? Seems to work with the maths also as if Wsinx=landa then sinX=1 when W=landa, which puts the first dark fringe at 90 degrees which is saying there wont be a dark fringe, just a light fringe gradually decreasing? Thanks for any help and for the video
@amansinghal2431
@amansinghal2431 7 жыл бұрын
thanks sir it really really helped
Polarization of light, linear and circular | Light waves | Physics | Khan Academy
14:30
coco在求救? #小丑 #天使 #shorts
00:29
好人小丑
Рет қаралды 120 МЛН
“Don’t stop the chances.”
00:44
ISSEI / いっせい
Рет қаралды 62 МЛН
Support each other🤝
00:31
ISSEI / いっせい
Рет қаралды 81 МЛН
小丑教训坏蛋 #小丑 #天使 #shorts
00:49
好人小丑
Рет қаралды 54 МЛН
Lecture 7 : Niave Bayes Algorithm بالعربى
23:13
Ahmed Yousry
Рет қаралды 63 М.
Single Slit Diffraction [AHL] - IB Physics
14:29
Mr. Brown
Рет қаралды 29 М.
Young's double slit introduction | Light waves | Physics | Khan Academy
9:33
khanacademymedicine
Рет қаралды 1 МЛН
Diffraction (Young's Double Slit & Grating) - A-level & GCSE Physics
19:01
Diffraction and interference of light | Physics | Khan Academy
14:38
Fraunhofer Diffraction Explained
13:35
Jordan Louis Edmunds
Рет қаралды 87 М.
Wave Interference 1 of 2 | Doc Physics
15:25
Doc Schuster
Рет қаралды 79 М.
coco在求救? #小丑 #天使 #shorts
00:29
好人小丑
Рет қаралды 120 МЛН