Spectra Interference: Crash Course Physics #40

[@crashcourse]

We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/3TW06aP

[@appleton282]

I can't live without CrashCourse.

[@upandatom]

The animations for this channel are phenomenal. Kudos animations team!

[@hamdaniyusuf_dani]

But you can find many inaccuracies, e.g. 0:08 the rainbow should be directed down1:40 the central region should be red2:09 0th order reflection should be white, while diffracted rainbow should have different angle than incoming light2:28 three blue lines on the left should have different colors4:42 subtle refractions are omitted5:41 glass only reflect around 4% incoming light, rather than near 100% as depicted in animation6:58 the analogy for polarization of light is misleading, as shown by third polarizer experiment

[@zarinawillows2347]

Your channel is also perfection dear.

[@BrittanyBearGoesRawr]

There needs to be infinitely more episodes of CC Physics. More people need to do physics!

[@wesleyscace6018]

Just want to say, this channel is awsome.

[@connormaclane]

We're doing waves at the moment in A Level, and yesterday my Physics teacher told us to go back over polarisation. So thanks for super awesome timing

[@TheRealSyncRow]

I do love that theme for physics, an amazing composition

[@puppylovergirl303]

Was that supposed to be Casey Neistat on the beach at the end? 😂😂😂

[@nachochips8090]

looks like em

[@phishENchimps]

you mean The Crypt Keeper.

[@baranxlr]

OnceUponAPiano 👌😤👌

[@Kabodanki]

bringing a skateboard to the beach, it must be him, if you know what I mean

[@josephcrossley9513]

Yeah it definitley is meant to be. He is the guy in the suit at the start and in the thumbnail.

[@MeatPops]

Really well done quick explanation. This series seems to keep getting better. Thanks guys!

[@gibatronic]

polarization is such a crazy concept!

[@nullempt]

Thank you very much! Our awful textbook didn't help me at all, but this video is a masterpiece

[@superrinocicorn2250]

I believe Daniel Lima is correct. A polarizer with a vertical grating ABSORBS vertically-polarized light, because it is the vertical direction in which electrons in the material are free to absorb the photons' energy and express it as increased kinetic energy (i.e. increased motion). Since horizontally-polarized photons cannot be absorbed, though, they simply pass through.

[@aldomaresca9994]

i love this!! great quality scientific knowledge for everyone

[@gracerussell6258]

I love Crash Course so much lol

[@LandOfSigh]

Do the "vertical" slits (6:45) only allow passage of the "vertical" component of the E field? I was under the impression that metal wires lined up in the "vertical" direction would filter out the "vertical" component of E field, allowing only the "horizontal" component to pass.

[@potawatomi100]

You're the best. Excellent videos and thank you for the great information and knowledge sharing.

[@revathikankanala3933]

I fell in love with Crash Course😍💖

[@rkpetry]

*[**01:36**] verbiage: "one wavelength" meaning light collectively not the length of a photon...* *[**01:42**] diagram: does not look like it has evenly spaced lines...* *[**02:47**] absorption: shallow lines, as such reemit the same-just less in the line-of-sight...* *[**02:54**] the sun is close-enough to measure line-of-sight spectra but not stars generally...*

[@alyssabueno6128]

is that casey neistat in your thumbnail?

[@alyssabueno6128]

7:01 OHMYGOsh it is haHAHhhahah

[@alyssabueno6128]

7:24 baHAHAHAhahasdfghjkl

[@cikif]

Are you going to make a course on Fourier Optics?

[@liisvastra6857]

Thanks. This was a wonderful episode.

[@iluvspongebob88]

i soo wish this was available back when i had to suffer through physics :P

[@AhsenJabbar]

woah! great to see my man Casey here!

[@hasranman]

3:35 where the hell are you swimming it doesn't seem safe

[@atharvas3244]

THANKS!!!! THIS HELPED ME SO MUCH WITH PHYSICS BY GIANCOLI 5TH EDITION. AGAIN, THANKS!!!!!!!!!!!!

Please add this video to the Physics playlist on your channel; it's the only one that wasn't included there

[@samirahman2112]

Infinity thanks

[@PCFL786]

superb video

[@ikust007]

Sublime!! My daughter Will love those videos! Beautyfull exemple for her. Bravo. From a father.

[@diepoplophoover1679]

NICE VIDEO!

[@mohammadumarkhan6339]

Great content and very helpful would you please make an offline app to access only physics section at crash course

[@ihartevil]

thx for another awesomely ha bisky vid i love these so much i dont know how much i follow it but i seem to understand most of it

[@TheFireflyGrave]

That groovy sun is hypnotic.

[@Manibe37]

You people are so awesome and unique

[@XxMusclecarsxX]

I'm in love with her

[@gusstavv]

I love her eyes!

[@Joeballs187]

love this program

[@veronicalogotheti1162]

Thank you

[@TomMinnick]

I have never been able to wrap my head around circular polarization. I understand it's effects, I just can't imagine how it travels in a spiral.

[@momchi98]

Like a dna molecule spinning on its axis.

[@danielifusp]

hi! there is a mistake in the polarization animation. the grade absorbs light on the same direction. a vertical grade absorb a vertical oscilation light.... sorry my poor english :)

[@williambarela2791]

No just the animation, but also the the verbal description. Why do they always get this wrong? I have seen too many videos where they say the light is blocked that is perpendicular to the polarizing lines. It is indeed the ones parallel that get blocked because the polarizing lines are conductive and the energy of the light is used up in creating a current on the polarizing lines.

[@lobsicles5903]

@@williambarela2791 it's explained in that way for beginner students. It helps simplify the concept but CC should have pointed out that the example they used was incorrect and only shown as a means of simplification.

[@potawatomi100]

Loved it. You're the best.

[@bite027_ketansharma6]

Nice job,good video

[@lewismatthews007]

Hi, Was there meant to be the next episode in this series released on Friday 10th February 2017? I thought one episode is uploaded every Friday? Is this wrong, or is the episode just a bit delayed going out? I'm using this video series as part of my AS level Physics revision. Thank you, Lewis.

[@talia9376]

i love physics

[@sevro6758]

very nice Videos

[@finnjr6365]

Yay! New video!

[@davidcampos1463]

Number 133 is my thumb up.

[@upandatom]

Everything is so bright here lol

[@TheCellCH]

that was interesting! also nice casey neistat figure 😊

[@rkpetry]

*[**00:08**] strange prism-not a prism...* *[**03:36**;**04:36**] nice diagrams-discover the width, of a photon, is greater than the length...* *[**06:04**] overstatement: deBroglie showed the wave is momentum, not electromagnetic...*

[@alkakhater1002]

Very informative

[@satwikpanigrahi7888]

Why don't you guys make a Computer Science course

[@momchi98]

Um, did you just predict it?

[@TheMitchy27]

Satwik Panigrahi you got ur wish

[@atharvas3244]

Uh they have

[@middlegrounds109]

You should have kept the sunglasses on for the whole video. Looks professional.

[@keghnfeem4154]

Yes when hydrogen is heated to high temperature it give of the spectrum. But when heated slowly what spectrum emanate first? I have seen mercury heated up slowly and ultraviolet light emanate first in a electric furnace.

[@EstWest]

NICE VIDEO! :)

[@__malte]

How long will this series go on? Not that I want it to stop (on the contrary) but I am just curious

[@thelonelydirector]

We'll be doing 46 episodes of Physics :) - Nick J.

[@gusstavv]

46? Awesome!

[@zarinawillows2347]

3:20 Is that a Michael Aranda cartoon ???

[@Karel_lmao]

This is symmetra talking about how she makes her god awful turrets

[@orthoplex64]

Symmetra is my favorite host

[@hammeringhank5271]

Cool, I barely understood it, but still cool.

[@marksusskind1260]

I can't look at some modern displays properly with my polarized shades. Sometimes, I get a large, black area. Other times, I see visible spectra.

[@TheRealE.B.]

My physics professor pointed out that if you lie on your side while looking at the water and are wearing polarized lenses, your glasses will NOT protect you from the glare because the polarization is oriented incorrectly. XD

[@devonferguson8834]

it really bothers me that all these diagrams of light entering glass/water at an angle do not show refraction

[@sebastianjohns2268]

Devon Ferguson yes

[@jesp1999]

When will a crash course for math come out? Maybe a calculus series or something?

[@linasjuozenas9589]

We all wishing for it... Too difficult probably?

[@puneetkumarsingh2989]

What happens to the magnetic field because if an electric field is parallel to transmission axis , the magnetic field must be perpendicular to the axis. Does it is blocked there itself? If yes, then why do we see light because light is composed of both the fields?

[@markholm7050]

Given the vast importance of spectroscopy in physics, chemistry and astronomy, and through chemistry, in biology, geology, planetary exploration, etc., your treatment of spectra was badly inadequate.

[@StuffIwannaRemember]

I have a query if anyone can answer, the polarization of the glases are only vertical I assume, meaning if you were to lay on your side, or turn your head 90 degrees would those canceled before be constructively interfered?

[@vitamindubya]

What about the other part of the double. Slit? The crazy part?

[@AssasinMilo]

vitamindubya if you're talking about the quantum physics part of it travelling through both slits it's easier to demonstrate with electrons because it's easier to fire single electrons than single photons but an actual quantom physisict can explain it better check out sixty symbols video on it

[@psychedelicpain420]

Goddamn, she is soo beautiful! Cant stop looking at her face...

[@jim1550]

If you like this "Light Fantastic" is a good BBC documentary on the subject.

[@jessecaine3779]

I NEED me a crash course Computer Science!!!! I need to teach my robot how to sing!

[@joaolucasgaldino9872]

My physics teacher said I won't need to take exams for the rest of the year if I find the model of a lens that: 1. Becomes thinner as you approach the edges 2. Has a higher refraction index than it's environment 3. Diverges light So here I am doing my research 😂

[@jimsagubigula7337]

Have you found anything?

[@sysconfig]

still going to fast. leave some pauses between the sentences please. other than that, great video 😉

[@kolbeowen3052]

B

[@nikkiberwal4042]

That was Casey Neistat recording himself for his next video ft.Shini Somara. Next time, will it be Superwoman and her Rainbow?

[@Doc_Loc]

forgive me if im wrong but isn't the guys shirt in the beginning pink floyd? (plz don't hurt me if im wrong)

[@momchi98]

So, where did the energy go when that one wave destructively interefered with itself?

[@momchi98]

Sorry for taking so long respond. But, doesn't that mean if you have a wave with 1 joule energy and it destructively interferes that the energy is lost? It has to go somewhere by the law of conservation of energy.

[@momchi98]

So, even in destructive interference energy is still transported? Imagine having two lasers th are exactly out of phase and don't constructively interfere, only destructively? What happends then?

[@TunkPotterSV]

She's very smart and pretty

[@anishtiwari1121]

why do shadows appear to touch when brought near?

[@FireBucket]

Anish Tiwari because the feet of your shadow touches the ground faster then the head of your shadow hoped that helped.

[@ras_al_juan]

could you improve accustics where you're recording? there is a pretty grating echo.

[@smthcool9656]

I like her hair actually

[@twiho]

Can I just say you are everything and gorgeous.

[@abilkhaiyrtaibekov8684]

Radioactivity please!!!

[@AlanHoey86]

Haha is that Casey Niestat??!!

[@criskity]

length, not lenth

[@2454014]

Vacuum vs Regular medium

[@SweetpeaSweet_pea]

Awesome (60th like)

[@681parth]

Why your app in iOS is not working

[@stevenreynolds40]

She is excellent at this! Unfortunately I'm having highschool flashbacks where I cannot pay attention because I'm distracted by the thought of her slit

[@jamespilcher5287]

When a light wave reflects back on itself and cancels itself out, where has the energy gone?

[@Doc_Loc]

twenty-four karot polar magic in the air

[@forehead84]

Great information but maybe don't edit out the pauses between each sentence next time as the content is delivered in what seems to be one giant sentence.

[@jamief3254]

3:39 RIP bird

[@theclipper8712]

very nice explanation mam/,.,.,.,.,.,.,.,.,.

[@shibanipinto7495]

does the color pink exist?

[@alfregbrannigan8588]

I LOVE FILTHY FRANK

[@justlol9474]

but i thought sunlight had circular polarisation?

[@albinscott]

Tricky!...

[@centrifuged0355]

Light has Dual nature, Or it's just a wave .?

[@softiebun9660]

HELP ME POLARIZE HELP ME POLARIZE

[@brianhack5806]

Just playing in an oil spill with things dying nearby...