I feel more enlightened after watching this. It really shed some light on this topic. Perhaps I am slightly brighter today than I was yesterday. It kinda turns me on

@michaelbryden1287

9 жыл бұрын

This dude knows whats up

@Zerepzerreitug

9 жыл бұрын

I'm blinded by your comment

@elahgammontez2487

9 жыл бұрын

🌟

@akshayrathore2882

9 жыл бұрын

hm so you can shag to that

@shafey

9 жыл бұрын

Hans Martin Vatnan Keep the puns light, buddy. You don't wanna overexpose yourself.

That must have been the best explanation of electron shells I heard so far.

This just became my most favorite episode of all crash course series. Analogies are perfect. So simple to understand.

I love this show. Thanks to everyone who keep this going.

@crashcourse

9 жыл бұрын

InfraRaven Thank YOU for watching :D -Nicole

@taipizzalord4463

7 жыл бұрын

What about the photoelectric effect that proves light is a particle. Please do a video on that. Love the content btw.

@real8660

7 жыл бұрын

i thought light was a duality and not a wave. it exists as both a particle and a wave

@Uncertaintycat

7 жыл бұрын

it does. here is a picture: www.nature.com/articles/ncomms7407

@pathtoknowledge6847

7 жыл бұрын

harly haze yes it is both a particle & a wave...

You just did an entire video on light without mentioning photons. I'm impressed.

Been watching CrashCourse since highschool and now that I'm a teacher, I still love coming back to these videos :)

You just said everything I was thought in a month

@tehyonglip9203

9 жыл бұрын

Taught*

@AdvosArt

9 жыл бұрын

Seems I wasn't taught enough English

@johnarken1810

9 жыл бұрын

Amar Duratovic CONFIRME...no wait...sorry.

@tehyonglip9203

9 жыл бұрын

You have just disproved it

@johnarken1810

9 жыл бұрын

Amar Duratovic 6 comments! Double Illuminati CONFIR, DAMMIT! Sorry, again.

MOAR. Just binge watched all episodes(up till light, which is the last episode as of now), took notes, googled stuff I didn't understand, fast forwarded stuff which I knew well and re-played stuff that was awesome. WANT MOAR! Awesome job :D

This ten-minute video made me understand atomic structure where two semesters of chemistry failed. Thank you, Crash Course! Love what you do!

This episode was so awesome. Well.... They're all awesome... But this episode was awesome

@THEGOUNIVERSESHOW

5 жыл бұрын

I also thought the one on the left was darker

Omg I want that periodic table at 5:22 as a poster on my wall... Make it happen plesh!!!! P.S: You explain how light is emitted faster than my physics teacher did... OVER ONE YEAR .__.

@unvergebeneid

9 жыл бұрын

Jordan O'C Apparently you can make it happen yourself: store.dftba.com/products/crashcourse-chemistry-periodic-table-of-the-elements

@Xenro66

9 жыл бұрын

Penny Lane Awesome! Thank you for the link :)

@electrolyticmaster8396

5 жыл бұрын

@@unvergebeneid thanks penny lane.

@unvergebeneid

4 жыл бұрын

@@kitty.miracle It's a poster. A physical thing. Of course it isn't free.

This was the hardest to grasp episode yet, but a fantastic and critical one. Also the Green brothers on the moped was awesome.

I'm excited about the next episode! Distance throughout the universe has always fascinated me. Thats for your expertise, Phil!

I wish this guy was my teacher at college...

phil you are an absolute legend ! your passion & enthusiasm is INCREDIBLY infectious !

Loved this episode!! One of my favs.

This is the best video on KZread for this subject, and I've watched many. Thanks!!

I have been using Crash Course videos in my daughter's history, science and A&P classes for the last two years. This teacher is the best. He explains the information about light with just the right balance of energy and calm (he is very easy to follow, others tend to go too fast for even me to understand 🤯). Well done.

This was very enlightening.

@riisntsryc3771

7 жыл бұрын

+Endrank luvs da 4 loco How nice of you :)

@mikhaeelkhaleck6777

7 жыл бұрын

flash of briliance

@porky8278

7 жыл бұрын

how puny

Its really amazing . This lecture has proved very useful in clearing my concepts and many doubts as well. I really felt educated on the subject. Thanks a lot and stay blessed.

Wow, just wow! This is getting better and better. Thank you Phil and the whole CrashCourse team for all the videos.

This has been my favourite crash course yet! It has just been so immersive and entertaining.

I've been waiting for this youtube video for years! Light is so awesome and so hard to conceptualize. Very well done, thanks!

CrashCourse This is one of the most concise, thorough explanations of the wave nature of light I've ever seen, with just enough mention of the actual structure of atoms to highlight how integral spectroscopy is to understanding the universe. Outstanding work, Phil and all the CC team!

Everything mentioned I already knew, but it was illustrated in way that made me appreciate the science so much more. Love the staircase analogy!

A lot of stuff that I didn't know. Thanks for this amazing channel.

Phenomenal content. I am in awe by the quality of how well this is written, animated, narrated and directed. I will be showing this to my students.

That was very well explained, I am learning about spectroscopy, and this video helps me to understand the concept better. Thank you

This was a brilliant episode. Very well written. Thanks for making it!

This dude is such a great communicator.

Good job Phil. Thanks to all for putting this together. Facinating stuff.

This show is just superb! Never get tired of watching these episodes!

What is (visible) light? It is a wave, period. At last, somebody who can explain this clearly. Inspired by the video from Phil Plait, I would highlight the following: Photon: Each photon is an oscillating wave which push and pull the electric field as it propagate in free space - creating local increase and decrease of electric field pressure - the same way as sound wave propagating by pushing and pulling on air molecules. Fourrier Series for light Our eye perceive exactly one octave, the red being equivalent to bass and blue equivalent to higher pitch instrument. According to Fourrier series, any wave that is not sinusoidal (produced by an object circulating around a sphere) can be simulated by adding a few sinusoidal wave which have integer multiple of the fundamental. For example, a square wave at 60 Hz can be simulated as follow: a*60 Hz + b*180 Hz + c*180 Hz where a, b and c is the intensity (how loud the volume is set) for each of these frequency. Changing these coefficients (and adding also the even numbered) would produce saw tooth or any other waveform. Brief, when a wave is not a pure sinusoidal shape, then it contains harmonics, which is small amount of wave with frequency exactly double, triple, etc. The color detectors in our eye may react when a wave of exactly double or half the frequency hit them. That may explain why light going up after blue appear as purple ; the red detector become activated. What are electrons Atoms are not like as small solar system with proton/neutron in the center and electron rotating around like the planets around the sun. The electrons are "something" which wiggle randomly "around" very fast, like a bouncing rubber ball inside a metal or glass sphere . Humming bird vision The uncertainty principle is related to our incapacity to figure out how much faster this "thing" called electron oscillate compared to our measurement devices. Predicting where is an electron with the present technology is like asking to a human to predict the location of the wing of a hummingbird. We just see a blurry cloud. But a hummingbird eye and brain is about 10 time faster than our visual system, so they see the beating of their wing when looking at them self in a mirror. Dangerous cliff Our distant ancestors, the Jellyfish, wisely selected the visible light to get the 4K clear vision that we enjoy today. Like all engineering decision, this choice represent a compromise between conflicting factors. Using a lower frequency, like the infrared, give more blurry picture, as any desert snake can tell you. Using higher frequency gives more clear picture, but can be used only on clear day time. Furthermore, the ultraviolet light (and X ray and gamma ray) is ionizing. It's energy is so high that electrons are kicked off atom and long molecules chain break apart. With UV light, the DNA data bank receive kicks in the teeth and cells forget how to behave politely in pluri-cellular society, which is perceived on the macroscopic scale as cancer.

I love how Phil injects his love for this stuff into every word he says. Also, Crash Course just taught everyone a month's worth of college Gen Chem in ten minutes, and it actually made sense. I love you guys!

I have watched almost every video of every series of C.C. and the Astronomy series is by far my favorite. This episode was especially awesome because it helped me appreciate how astronomers gain knowledge of the universe. The visuals and explanation of light, atoms and their correlation were the best I've seen.

There is so much information jam packed in this episode. I will have to watch it again.

I love crash course!!! They make everything so much easier and interesting!

this guy is amazing. i should start crashcourse astronomy even though im not studying anything envolves with astronomy. his just brilliant.

So far, this is my most favorite episode in Crash Course Astronomy. Thanks, Mr. Plait and Crash Course's team. :)

This is the best series on Crash Course! Thank you, and keep up the good work!

Was the left one slightly darker?

@markkeilys

9 жыл бұрын

FunkyHonkyCDXX nope exact same ... after the compression of youtube..

@boomstick900

9 жыл бұрын

FunkyHonkyCDXX That is what I perceived also, but ***** is most likely correct.

@markkeilys

9 жыл бұрын

boomstick900 i thought the one on the left was slightly darker too but then i checked and they were the same

@AthAthanasius

9 жыл бұрын

FunkyHonkyCDXX Any perceived difference is likely a mix of the background around them being slightly different and us looking /really hard/ for a difference and fooling ourselves.

@FunkyHonkyCDXX

9 жыл бұрын

Ath Athanasius I had a feeling it was the background causing an illusion. Thanks!

my mind is always blown when I learn how it is we know things about our universe. Science is awesome

i LOVED this episode, thanks a lot, hope this show continues a long time on, i never get tired of it!

Awesome explanation of light - particularly admired the graphic, explanation of the role of the electron and, as always, Dr Plait's enthusiasm and captivating delivery.

This episode was very illuminating.

@spodermen7266

8 жыл бұрын

Hahahaha ha ha...

It's insane thinking about how we are just extreme luck and that if a certain chemicals never existed we may never of existed. Keep up the good work Crash Course :3

This episode was very well done! (Most episodes usually are, but I really enjoyed this one in particular!)

This astronomy crash course is awesome and I really like Phil Plait! It is simple and fun. Thanks!

This video is enLIGHTening. Heheh.. Sorry everyone..

@DrSpaceman69

9 жыл бұрын

Casey Edwards pun racoon is proud

@Nihilnovus

9 жыл бұрын

Cmon man lighten up why you gotta be so dark...sorry couldn't resist

@crazysquirrel879

9 жыл бұрын

Casey Edwards that pun was great soon it will be universal(was that even a pun....sorry)

@dejureclaims8214

9 жыл бұрын

Casey Edwards No forgiveness...

@samgilfellan6352

9 жыл бұрын

Now that's what I call a.... Shitty joke! (sorry)

Episodes like this are the reason I love CC Astronomy. Phil, keep up the excellent work. You are awesome.

These videos are amazing, keep them coming!

This is astonishingly helpful! THANK YOU

8:36 was a beautiful performance.

This series is AWESOME!!! I never knew how interested I was in astronomy until discovering this series. I’m totally blown away by all the great info in this course! Really wish they would’ve taught this interesting stuff in high school. 👍

I'm rewatching these series. And I just remembered how eye opening about science this particular episode is. Very, very great one. So much so, I've spent my last 2 hours, maticilously translating it to a very good Turkish. People should watch this in every possible language.

Awesome video. It's so fundamental, this should have been shown earlier in the series!

"Can you tell the difference between these two squares?" Me: yeah "Your eyes probably can't see a difference..." Me:🤔

@kolbeowen3052

4 жыл бұрын

Lizzy Burt I saw the difference as well lol

@sudipa2010

4 жыл бұрын

Yes, the left one was brighter red.

0:19 The first thing I thought of for that hint: He's obviously waving and waving is a form of greeting someone, saying hi is also a form of greeting someone, and if we look up high, we see the sun, and the sun produces light?

@aeulloac

9 жыл бұрын

I don't think you're right. Light is a wave, so he 'waved' his hand, get it? c:

@egarutemn

9 жыл бұрын

Adrian Ulloa I think he was trying to convey a joke.

@unvergebeneid

9 жыл бұрын

Kevin Blake I couldn't even think about the meaning of that hand waving because after "how does light get made" I was still trying to picture a couple of photons awkwardly having The Talk way too late with their kid after like 5×10^16 m: "If a wave and a particle love each other very much ..." "God, mom! I've _seen_ electrons transition to lower energy states before, you know."

@frollard

9 жыл бұрын

Kevin Blake Half life 3 confirmed.

What wonderful explanations, great video series. Thanks to Phil and the PBS team!

Your videos are so awesome!!! I love your energy and passion about the subject and how easy you can explain it. Thanks!!

At the quantum level though, light is actually a particle... and a wave.

@minimooster7258

9 жыл бұрын

I didn't know the cat was dead ubtill we got to the vet's...

@deeperlayer

9 жыл бұрын

***** an electron you mean not light

@LordDrCruel

9 жыл бұрын

Thats probably being saved for Crash Course Physics

@Shoshk3

9 жыл бұрын

Dany J. No he means Light, Photons behave like particles with wave properties, or more like a wave with particle properties. really cool when you get in to it, and it was the only thing i was bumbed was missing from the video, but for astronomy the particle properties of light are no where near as important as the wave properties.

@deeperlayer

9 жыл бұрын

Gabriel Soos in case of light i wouldn't consider it cool, it's just that something is missing in the whole process and we'll understand it one day whatever other physicists say without physical evidence in my book light should always act as a wave. in case of an electron it has mass so its wave like behavior is actually much more interesting to get into

@ 7:32 photoshop tells me that those are the exact same colour youtube processing does this sort of stuff to preserve bandwidth

This is the best, clearest explanation of spectroscopy I have found so far. Very well written Phil.

Finally, glad that I have a clue now on how does scientists find what's in an object billions of miles away! Thanks a ton for making it so easy to understand.

The guy on the motorcycle looked like hank green

@ildikoki

7 жыл бұрын

it is John and Hank Greene

@razzolap2500

5 жыл бұрын

It’s from the movie dumb and dumber

I learned a lot from this video

Awesome course Phil! You are a great teacher. Everything is easier to understand when you are explaining it :P

This show is the best. Thank you all who were involved in it. This is why the internet is so cool. I would have never learned so much about space in such a fun way.

7:13 Soooooooo many puzzle pieces just fell into place.

Just a small correction: we didnt evolve to see the light which the sun emits most strongly (it emits electro magnetic waves outside our visible spectrum too, and granted it is not as strongly, it probably would be useful to see and differentiate the wide band of IR that the sun emits, which is much wider than our visible spectrum); we evolved to see the light frequencies that water lets through instead of absorbing. Considering where we come from, there wouldnt be much point, evolutionary speaking, to waste energy on being able to detect light waves that wouldnt penetrate water anyway. So water is very much the key in the evolutionary "decision" for what light we can see, and not what light is "emitted the strongest by the sun". If we had evolved on land instead of water, then no doubt our visible spectrum would look different and be expanded a fair bit into the IR section.

@madLphnt

6 жыл бұрын

that all makes sense but it cannot be the reason we as humans don't possess the ability to see outside the visual spectrum because mantis shrimp have 16 different types of photo-receptors and they evolved underwater so that isn't the reason we as humans don't have the same ability.

@aeroangel3321

6 жыл бұрын

How do you explain the Mantis shrimp? Or bugs? Also there's no definitive reasoning that can be proven by experiment, so unless something is an important distinction in the subject at hand... astronomy.

@thundercactus

5 жыл бұрын

​@@madLphnt I understand your point, but why don't MOST animals have 12-16 color receptors and eyes that can individually perceive depth? We all started underwater, yet the mantis shrimp seems to be the only animal to have evolved this incredible ocular trait. I suspect the answer lies in evolutionary pressure. We didn't evolve more complex sight, because it was good enough just seeing the spectrum it did. In fact, many animals beyond old common ancestors may have gained or lost photoreceptors. We've gone this long without seeing the near-infrared spectrum, what advantage would it really have for us now? The mantis shrimp lives in shallow tropical and subtropical waters, meaning they ARE exposed to UV, and likely some near-IR as well. Although far-IR hardly penetrates water at all. They also see polarized and circularly polarized light, of which the latter is almost unheard of. Clearly, judging by the the other animals in the same environment, it's not a requirement of catching prey. So it's likely a sexually advantageous mutation (like blue eyes, not actually advantageous, but attractive), which became used in communication, and later helped sexual selection. The fact we're discussing this at all is proof that genetic mutation can offshoot real freaking hard in one direction. Many other animals can see, but the mantis shrimp just sees better than the rest. Likewise, a large number of animals can think, and even communicate concepts to their kin (like corvids), yet we seem to be the only animals capable of communicating incredibly complex ideas. I'm fairly confident that even if you could communicate in the language of corvids, you could not explain trigonometry to them.

@barnerkonvicka5911

5 жыл бұрын

shut up

@bullrun2772

4 жыл бұрын

GroovingPict not reallu

Brilliant! No words can describe how amazing this series is!!

i love this show. so much info in 10 mins. keep going

This blew my mind... wow

@iona-airen

8 жыл бұрын

+Nao R :D

Hi Phil! Is there a way to gain access to a HD image of this very nice periodic table at 5:15 Can you host it and give a link? Thank's in advance!

@AzureKite

9 жыл бұрын

***** store.dftba.com/products/crashcourse-chemistry-periodic-table-of-the-elements you can buy it as a poster here. And then scan it to have an HD version of your own I guess.

Simply one of the best channels on KZread, period.

Amazing videos,... more please! I truly enjoy learning and putting the puzzle of the Big Picture together. Thank you!

godddddd...jesus.........i'm living for these 3 channels...1..crashcourse....2....it's okay to be smart....and 3...kurzgesagt in a nutshel.......................love these 3 channels............guys keep making more stuff like this ,,,i feel so powerful and enlightened when i watch these kind of videos.............much appreciation,,love and respect from india,,,

Its a course in astronomy. I just came here 24 videos ago to learn about right ascention and declination.

One of the best educational videos I've ever seen. Love you, CrashCourse team!

This is one of the most informative and accurate videos on the physics of light that I have seen, and I've seen quite a few from private youtubers and universities. I'm happy that he did NOT mention photons, or particle properties of light, but just the wave properties, he is more correct then other people. That being said the video is not 100% accurate

How can light be real if our eyes arent real? - Jaden The Philosopher

@HRCFre4k

9 жыл бұрын

Husein Ali Your forgot to use more capital letters!

@dvoraj20

9 жыл бұрын

HRCFre4k Worse, he forgot an apostrophe. Even worse, an extra "r" has crept into your sentence.

@alucardwhitehair

9 жыл бұрын

Husein Ali Jesus Christ he makes real philosophers look bad. What Is The Second Word Of life As Life Sees Itself? -Jaden Smith

@SaidinRage

9 жыл бұрын

Husein Ali A lightswitch

@markkeilys

9 жыл бұрын

***** bad day?

7:35 Is it weird that I can somehow tell that the box on the left is a darker shade than the box on the right

@ajnur4466

4 жыл бұрын

opposite

@JohnDoe-dj3lw

4 жыл бұрын

AJ Nur it’s actually the opposite yeah. At first glance the right one looked (very)slightly darker

I love this Crash Course so much! Astronomy, guys. It's the best.

This was amazing. What a perfect explanation. Thank you!

How does the electron decide whether to stay on their step or go down and emit energy?

@crystalgolemcolossus

5 жыл бұрын

Meditation

I want that periodic table, where can I download it?

@crashcourse

9 жыл бұрын

Daniel Nuske No download link, but a poster is available at www.dftba.com/crashcourse

@rebeka1212100

9 жыл бұрын

CrashCourse Hello because of my internet speed i want to download your videos only for my self and watch it over & over. can i? (I have a software for downloading videos)

@kingsleyboateng7189

8 жыл бұрын

+CrashCourse Is the electron concept on the stairs how plant grow? Because you said they need light and energy to jump up the stairs

@AaronLow1

8 жыл бұрын

+CrashCourse Omg No way! I want one! I hope it has oxidation states too... That would be helpful.

@teubert2

8 жыл бұрын

+Melissalynne7 Snipping tool is better imo, although I suppose you can take a screenshot first and then use it on the screenshot.

Best lectures in this channel comes from this guy Easy simple and can draw some light on complex subjects without letting much-needed information slip

I love Crash Course Astronomy. It reminds me of things that I've learned but forgot and teaches me new things that are awesome.

Just getting educated at 6:48 before I've even eaten👍

Dammnn!! Watched this at 2am here, who knew science could be this interesting 😂 Thanks to Phil! And cc.

I already know a lot of this stuff, but this series is so well made, I can't help myself but watch it. Phill is so charismatic, you can't not love him. Wish bloke like him taught in my class, I can guarantee a lot more of my former class mates would have been into science.

I don't know if you are going to read this Phil, but anyways I would like to thank you very much for this series. You managed to make astronomy more interesting to the masses, and you did it by not making it too hard to understand. I am a civil engineer and I love astronomy,physics and math. So I felt very happy to see this, and I hope we have more episodes of Crash Course Astronomy. (also recomended to some friends interested in astronomy to watch this ASAP!) A big fan of yours, André Gomes

"here"s a hint" then proceed to wave. fucking brilliant, i laughed more than i should have ^^

The square on the left was a bit darker of a shade, or at least that's how it looks to me without looking at rgb values.

@JohnDoe-dj3lw

4 жыл бұрын

Ben Toth opposite

The best explanation of light I have ever seen. Thanks Professor Plait.

These videos are really a gift to the world. Phil is brilliant, articulate, and fun.

So.. u could technicly find out length, distans, mass, health, etc About any person only by capturing, analysing and seeing their electro magnetic lights?

@BrokenSofa

9 жыл бұрын

Not really health.

@BrokenSofa

9 жыл бұрын

I don't think you can find out the mass either.

@MrATN800

9 жыл бұрын

Broken soffa How about by seeing how it distorts light patterns ?

@Ddub1083

9 жыл бұрын

MrATN800 That would require a VERY VERY specially designed experiment, but yes technically you could determine a persons mass if you knew the vector of a light source and could measure the incredibly small amount of deflection a human sized mass would bend it.

@SuperPeacefulguy

9 жыл бұрын

just wanted to be in this thread until someone could answer or explain your question

I just love the fact that this man never feels the need to shoehorn 'comedy' into his presentations. Plait don't need no pyrotechnics. Just him and the facts is all the magic we need. (Can't say the same about Craig over at CrashCourse Politics. How many failed attempts at dry humor does it take to realize you're consistently coming across as a cantankerous mope?) Phil Plait For President!

Great video! So much explained in a short time! I loved your stairway analogy of Energy levels.

this is so good i use it for my homework and plus its so entertaining i love whatching docuentries like this plus u have a good sense of humour PLEASE DONT STOP MAKING THESE!!