Introduction to waves | Mechanical waves and sound | Physics | Khan Academy

[@EdwinLuciano]

Watching this video, I felt a great disturbance in the rope, as if billions of atoms suddenly cried out in terror and were suddenly jostled. I fear a wave has happened.

[@benjamintchang3923]

lol

[@monsterjazzlicks]

I am a musician trying to learn this stuff quite late in life. The easier and longer the explanation is, the better (for me!).

[@05afnanabdullah87]

monsterjazzlicks there's never too late for this man! i appreciate your efforts. :)

[@monsterjazzlicks]

Afnan Abdullah Thanks a lot AA. I appreciate your encouragement ;-)

[@bcjdjjdjfjjdks7889]

Wow, this was 5 years ago, how's it going?

[@monsterjazzlicks]

@@bcjdjjdjfjjdks7889 Well, I passed my Level 2 Maths, thanks.

[@bcjdjjdjfjjdks7889]

@@monsterjazzlicks oh great

[@AJ20ist]

u sir deserve the TOTY award (teacher of the year)

[@phillipchen299]

shouldn't it be a TOY? (*the* doesn't count)

[@gcldk2552]

A comment coming out of India, where there was a movie which went by "SOTY: Student of the Year", so you know it has to come out the way it came out mate.

[@bry0]

Teacher18 teacher of the year packs

[@kartiiik]

If Sal ever became a teacher in my school, all the other teachers would be out of a job haha

[@TheScienceCube]

Hi Kartik! Sal is a great teacher but there are a lot of other good teachers in our schools.

[@bootyshake5043]

@@TheScienceCube Yeah Right

[@normalpeoplelikeme]

@@bootyshake5043There really are though. There are many teachers I fondly remember from Elementary, Highschool, and even now in University.

[@hoffman164]

I predict that soon Sal Khan is going to be given some prestigious award for his efforts on youtube. And if no such award exists then someone needs to make one!

[@TheBancho22]

WOW !!! Every time I watch a video of yours I get astonished by how simple and yet in a interesting way, you explaain everything. And I mean everything. No matter what the subjects is, if I'm having some problems with trying to understand sth and its giving me headaches, I just say to myself: "Gee, I sure hope Sal has made a video on that." And most of the time, you have. It's like you understand absolutely everything and you're like 10x better than any of my teachers.

[@aldenpascual1979]

Whether I pass my medical admissions test or not, your videos have been a big help for someone like me -- I've graduated college 7 years ago, and I am now a physical therapist. I just decided to pursue medical school, so I have to take the medical college admissions test. It's been a long while since I last read my chemistry and physics books, so I have to admit, my brain is now rusty on those areas. Your videos, and the way you teach made it so much simpler for me to get back on track. Thanks!

[@wildpeachie]

You graduated yet? :D

[@dogsRoxXD]

Mind you, this is on the internet, not a class full of noisy students. Don't be too hard on your teacher!

[@dogsRoxXD]

No u

[@eesaytson1440]

+Scrub Lord +dogsRoxXD me too! - via YTPak(.com)

[@eesaytson1440]

YTPak is adding a watermark to my comments? Oh well. Price to be paid

[@eesaytson1440]

Scrub Lord u first

[@anishasunkara4542]

no one is noisy in my classes but the teachers still don't teach

[@james5960]

Sal is the second jesus cause im pretty sure hes saved more science grades than just mine here. ;-)

[@metube0902]

This is amazing. My science teacher despises KA, but here I am, doing amazing cuz of Sal...

[@NumbToons]

literally th best introduction for waves, on planet earth.

[@AlexMarioMedia]

We watched this today in Chemistry class and the entire class burst into laughter because of all of the "jerking up and down" in this video.

[@mrvk699]

Why the hell did you watch this in a chem. Class? Isn't this a physics topic?

[@AlexMarioMedia]

The substitute teacher pulled up the wrong video.

[@miltonmilton7251]

AlexMarioMedia

[@aeroscience9834]

+Vishal Kumar To introduce them waves so they can understand the quantum wave characteristics of the electron in the quantum mechanical model of the atom (maybe)

[@bjorlam8201]

+AlexMarioMedia How old are you? 12?

[@BillyBobThe8th]

wow i finally got longitudinal and transverse waves from this one 13 minute video apposed to those 4 lessons we've had on it

[@virtuosoikingpin]

Thank you so much! The problems are easy for this chapter, but I was lacking the intuitive understanding that will help me remember how to do it on the AP test. That's where you shine, not many other teachers have the capability to teach intuitively.

[@khalid5944]

Man, Your the best. You have a degree in Social Studies, Math, and science

[@xxAnaconta]

how much more sal deserves for his tremendous dedication on helping us its rare to find such people this days almost impossible again thank you men

[@amimm7776]

Explained in 14 minutes what my teacher couldn't in 50

[@habibarady900]

50 years

[@lukes6578]

Man, 10 years old but still good some of the best youtube schooling

[@Bysin769]

I covered a piece of paper with curved lines and when I finished, I could look at the paper from the side and be able to see waves going in several different directions! It’s crazy to look at but it’s still very cool!

[@eyeseez]

thanks so much Sal, I have a big science test tmr on energy, specifically sound. thx a for this video:)

[@msfaithprincessfaithrollin6704]

So that's why you're here!

[@sleepyxyz5]

Thanks a lot Sir! Ur awesome =D I have my AS physics exams soon n this really helped me a lot.....I'm too lazy to open the book,this is explained better anyway so thanks again! =) May Allah Bless you for everything you've done for so many people!

[@oofrost111]

this video helped my alot thank u so much!!!

[@watchfulone478]

I love you. My science teacher just reads of a slide this is soooooooooooooooooooooooooooooooooooooooooooooooooooo much better

[@Sodium_chloridefjfiidk]

Alhamdulillah... The class helped me a lot...

[@Sonatarium]

You just got a new subscriber. Thanks alot. With you I can understand everything even more!

[@dannesempai]

haha, I got a test on this on friday and I´ve been waitng for this for such a long time ;) Thank you!

[@tropicalb3ar268]

That was 10 yrs ago, did you pass???

[@vortex1708]

@@tropicalb3ar268 Oh my god YEAH!

[@vortex1708]

How'd it go :0

[@SoSweetLikeCherry]

I missed 2 whole weeks at school, while we had to examine this part. :( I have an exam in 2 days, but you are such a big help !

[@dubbleplusgood]

it's simply stunning how amazing all the videos are. Please keep them coming and thank you Sal. :)

[@adan3633]

Bro you are old

[@forriwaj]

Thank you. It is the best explanation of wave so far.

[@chad999]

10 years gone still he's teaching better than my college teachers

[@DelijaZauvjek20]

Khan, do a video on standing waves.... I won't be able to make good use of it since my test is tomorrow, but I think it will help a lot of the future students :)

[@tareksamy7630]

How amazing are you! Please keep going

[@benacademyofscience4556]

Awesome,thanks for the tutorial.

[@farhanhasanah309]

I can understand waves better now, thank you♥

[@brandongunnerhall]

Nobel education prize is deserving for you, i hope it exists.

[@nali3117]

Thanks u so much for this explanation. Waves is the one topic in physics that I absolutely hate but now I actually like it cuz u explain so well. Thanks so much again. Hopefully this will help me out for my exam tmr😊🙇🏼

[@ramyramadan3543]

Did you do good?

[@Chaosflyex98]

Hi Mr. Khan! Thanks so much! This very much helped with my review for my science test on sound waves and light! Wish me luck ^-^ Keep this up. :)

[@amrkassab291]

Did you pass?

[@GeneralSaddam]

Foreal i learn more watching one of these videos then in a whole year lol

[@many3440]

Salman you are the best one explaining!! wish you could do the tutorials of all the videos!! you are the best!!

[@Ghost572]

I just wanna say thank you very much for this video rofl, been researching sound for a day or two now!

[@NoRefundsXD]

Got a waves + optics test soon. As always, I'll be using KA as a study guide. Thanks!

[@dogwithwigwamz.7320]

Khan, it appears, has finally managed to learn how to draw/ sketch. `None happier than I for the fact.

[@TheAshray9]

may be i was using wrong concepts but sal you had cleared all my doubts

[@livberglund7910]

"These guys are all scwunched up together"

[@zakharovhasan2176]

Awesome defination of wave !!!

[@morimori6360]

Watching this for my Gen.Physics 1 subject😊

[@nilatstc]

awesome...my physics module just started waves today...hope you'll do videos on EM waves, optics and quantum physics

[@MrKorrazonCold]

"Every action has an equal and opposite reaction oscillating in periodic or harmonic motion."

[@aeroscience9834]

One could argue that an electromagnetic wave does propagate through a medium, where the medium is the electromagnetic field

[@bjorlam8201]

+Aeroscience EM waves can propagate through a medium however do not need to (as they can travel through a vacuum)

[@rishabhjain1294]

Aeroscience no sense at all

[@AshThumbsUp]

10:15 "I just jerked up, down, and back again." LMFAOOO- *COUGH* *COUGH* XDDDD

[@arnatri1503]

Man! You know everything!

[@smitty16082]

You are a god amongst men.

[@Daia-48]

i think im in love with this guy ......

[@Gangstaq8]

Ah ! I have been waiting for this . . From ages . . Thankx

[@LunHaolai]

Nice... sal btw please do more is higher level economics and finance...

[@jaakkokuu]

Great vid and like many times before... perfect timing =) Thx Sal.

[@rubmasta1]

Sal you are the man! cheers from New Zealand. I hope you do some vids on optics that would help me out a lot =)

[@patricktan2553]

Nice analogy there (Y)

[@drakerocky7808]

Hey sal.thank you so much man

[@giordanoalessandro4]

nice explanation that was tops thank you :D

[@homegardening2766]

SAL ROCKING!!👌

[@ad2181]

Sal, Keep up the good work. I enjoy your programs. I recommend the Dover paperback book "almost all about waves" by Bell Labs John R. Pierce, a great engineer. There is a section on how the ears works based on reflections.

[@iamkazaam]

If this man does not a win a Nobel prize within the next decade, I'm leaving Earth.

[@ThePanthos]

sal is a king among men

[@cisco3966]

Hahaha, wish you put this up last, got tested on this stuff last Wed. but still enjoyed the vid. Should still come in handy for the final :)

[@RYTISJAS]

hey, great video! Have a great evening :)

[@rahmafawad979]

Thank you and helped a lot

[@maxpolaris99]

Very Interesting. Now can you break down basic spectroscopy for us like I'm a four year old?

[@lakshmamanv7936]

he is a genius × infinity times

[@TheScienceCube]

Nicely done!

[@shashikanthp3145]

The mouse cursor should've been white in colour on a black background !!!

[@kylamarie6619]

thanks it helps a lot

[@GOODBOY-vt1cf]

thank you so much

[@lilbombdope3809]

you really understand me

[@hachemelouggouti1967]

What I haver never understood is how Huygens principle could ever be applied to visible light: light density diminishes with (the square of the) distance until it disappears completely. So the idea of secondary waves keeping the main wave going certainly does not apply to visible light.

[@bikrantasarkar]

why did you plotted the graph for longitudinal wave by taking the top part of the compression and lower part of the rarefaction???why not vice versa?

[@rishabhjain1294]

Bikranta Sarkar Abe ullu keep pathe

[@nat-en5rt]

He plotted the graph according to the density of the region in the air, the compression zones have a higher density so he plotted such that the highest point on the graph would be the middle of the compression zone, vice versa for the rarefaction zone.

[@richtaylor93]

Yep sound waves in pipes and harmonics would be good

[@brinjoycesimpson]

Very interesting.

[@tusharpal5431]

A Wave is a disturbance of exactly "what"? What is the thing that carries energy in a wave? In these examples, you showed disturbance of a particle. But what about in Electromagnetic waves?

[@PressStartLetsPlay]

congrats, you are correct

[@Dark1Masta]

Great video !! Can you do videos about histograms in statistics btw ? PLEASE

[@luzye]

Thank you very much!

[@inphiknitfractal]

Any chance of getting you to do a video on wave phase conjugation, implosion & centripedal force/ gravity?

[@aftab7471]

are the transverse waves and the periodic waves the same things????

[@marwanabdelr6619]

at 8:58 he wrote souud wave

[@Chelsea-gs7qj]

Can you make a video on shock waves?

[@jesselbtw]

Thank you

[@rajuakhil7099]

Thanks soo much

[@nurulainamirh]

Thankyou sir

[@sitaramar13]

have a doubt sir. In wave propagation water or sound , how individual particle vibrations are transmitted from particle to particle in the direction of wave propagation? There are gaps between particles in solids, liquids and gases. Is this not against principle of locality?

[@Un1ted-Kingdom]

Hello Sal.. i have a question.. and i have been looking for this answer in many videos and i couldn't find it :/ ( How would you be able to draw waves like after say 1/10th period ? when your given the distance of 1.8 cm between the displacements in the equilibrium. ) Thank you ... for answering this ( i really need help on drawing them)

[@pankajpotdar24]

charioter Jaffa Cakes h

[@EclipZeMuzik]

hell yeah bro!

[@OOzd95]

incredible

[@pokeanalysis4917]

sal what software are you using

[@NicolasUnger]

@hoffman164 Google gave him 2 million dollars. To make the site even better, and to translate the videos to several languages.

[@taniallady]

I'd be more disturbed if there were no waves.😅

[@Swetlana0]

I am eagerly waiting for the next video!!! Awesome explanation.. ¡ʎzɐɹɔ buıob ǝɯ ʇob

[@hassanch64]

which software are you using to create these videos

[@zahra5991]

first, I like the video and the simple way that you used but the problem is I couldn't find the related videos so may you but it in one list please thank you

[@ommorgovekar9923]

awesome