Atomic Energy Levels | Quantum physics | Physics | Khan Academy

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In this video, David explains how an atom can absorb and emit photons of particular values and how to determine the allowed values.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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[@_JonJon_]

Whoever did this video really should be a teacher.

[@jacobfeltman]

He is a teacher. He's teaching in the video.

[@pratheekshanbhag4980]

True brother

[@user-kb1dw9kg9j]

he is a teacher

[@maisoncayson4542]

instablaster

[@Matt1979321]

Not so sure, he did miss spell diagram

[@nandsingh738]

Every complex concept that I struggled to understand is crystal clear now!! Amazing teacher.. I would say he is the BEST TEACHER!!

[@taaha6335]

This man killed it , this is without doubt the best lecture on emission and absorption spectrum

[@Akin_-ke6oz]

yh thats crazy

[@burpie3258]

Love how you accurately coloured the photons 🤩

[@seasnek7024]

When you need to use some good ol physics to help you start to understand some chemistry

[@wozahslampers8266]

Then there was chemistry keeping me from understanding my physics😂

[@NihongaDaisuki7]

I went to study Biology to realize I need to understand Chemistry, just to realize I also need Physics and now realize I'm gonna need Math. it all connected !

[@kalbian5430]

It was that simple all along..... I'll never forgive my teachers nor my textbooks.

[@RM-pf1mt]

Us bro us...the struggles I had to go through to understand this...I will never forgive any of them

[@andyj9680]

This was one of the best videos i seen on electron volts. Make more. Keep teaching in this style.

[@jameskonefal3453]

Excellent for AQA AS Physics revision. The only thing I would add is that electrons can also be excited when an incoming electron collides with it. In this case, only a minimum amount of energy is needed to excite the electron, it doesn't have to be exact, as it does with photons. Thank you.

[@vishnumoorthy8859]

Thank you for this. Wish all teachers explained like this. And really appreciate the photon Colors changing with the eV.

[@jessevandiemen9439]

Mate this is by far the clearest explanation I've had about this subject, major thanks bro.

[@orkungumustekin9191]

Great explaining, thank you!

[@daniellelewis3175]

This video was great! Best video I've watched that explains so well.

[@comebackata2]

AWESOME! Thanks for the simple explanation!!

[@nguyenquocbao1143]

Omg this answered everything Ive been stuck today thank you!

[@dhruvs4875]

Electron with positive energy - IGHT IMMA HEAD OUT

[@allbyrs4903]

Actually it's like...-13.6 eV to -3.4eV to -1.51 ev to -0.85ev to -.54 ev and so on...
So in a way it's never positive but increasing
Hope this helps
And the above values are true for H atom species

[@PinkeySuavo]

I dont get this comment?

[@nikhilsomvanshi9960]

@@PinkeySuavo It's a reference to a meme

[@PinkeySuavo]

@@nikhilsomvanshi9960 which meme?

[@nikhilsomvanshi9960]

@@PinkeySuavo Google "Aight imma head out" meme

[@xsamerx4]

If David have series at his own , i am willing to watch it all

[@Chris-iw7tq]

You deserve more fund. Really nice explanation

[@RS-tn4fs]

Wow, mind blown. Great presentation!

[@user-me2px6zn8b]

Very explanatory....!! ❤❤ Amazing ...your hardwork reflect....!!! Keep it up 👍

[@arbazahmed5753]

Great description ❤. Thank you.

[@dylansheridan2892]

This actually was very helpful. Thank you and God bless.

[@devashishthapa6264]

thanx for this very informative video. this is the best video on the atomic structure I ever saw. background music is perfect too.

[@nicao_o]

Thank you so much for explaining this it really helped

[@adrianbiber5340]

I FINALLY UNDERSTAND SPECTRAL LINES and I'd stopped looking for the answer! Thank you!!!!

[@shiddy.]

this is a great way to explain this - bravo

[@jhojanramirezmatos1960]

Excellent video. Explains very well and easy to understand

[@kazishahjalal6852]

Thank you sir, all my doubts are clear.

[@nikitarahman5084]

The background music makes it more serious to learn...!!..😅

[@manuelcardoso7595]

Wow. This is actualy a fenomenal explanation

[@razamadaz3417]

Straight to the point with a bit of comedic sarcasm, me likey...Thumbs up for explaining this in a simplistic manner.

[@stevencooke1027]

That said, this is an excellent video, taking a very complex concept and making it understandable.

[@laibarehman4041]

It was so helpful ❣️

[@ifeanyichukwuidoko6599]

Thank you. Well understood.

[@humairabinte5619]

This is literally amazing !!

[@elenaruh2144]

I am SO grateful to the maker of this video

[@sneha6543]

This is wholesome bro he just nailed all the concepts 😭🥰

[@SSS-lh5qe]

Excellent video .... just suggestion ,I would be better if you could show how deionized the Ion with calculation in last explanation.

[@herambpatilofficial]

One of the best videos of Khan Academy...

[@crowncrow133]

Quality content, great work :D

[@JAY-xx7zl]

Thanks for the SuperExciting Vedio Sir ⚡

[@yamilao7556]

dude i knew scientists could figure out the different elements of distant celestial bodies, but now i finally know the principle behind it!!! i'm pleased

[@tawseef167]

Really appreciable

[@tshiamo3524]

Thank you so much for this video👌👍

[@noreaction1]

6:08 how can you tell from a given fingerprint that is measured when you point the lense in a given direction, that the bands you find are missing come from exactly cloud 1, cloud 2, but not cloud 3, etc.?

[@catthebatflute]

The music in the background really added to the lesson.

[@sejarahwisdom7762]

Wow, that's really nice

khan academy is so amazing... I highly recommend every one to see khan academy!!!!!✨

[@joyce-je6hr]

omg... i think i actually understand this now. wow, that's amazing.

[@evelyn-dx5vi]

Best video，thank you

[@basharalzohily7017]

Many thanks. It was very helpful

[@mattgraves3709]

Outstanding explanation

[@_farisifahri9619]

Great one

[@lusandalaugesen103]

He’s really good at explaining.

[@wesleyverity7310]

Yes dude Excellent video

[@adityarajsinh_gohil]

Awesome!!

[@GreAse0MonKey27]

who ever made this video should have a private channel and make videos like this of all these concepts. The best explanation video

[@haseeb6053]

Okay, electrons can't just absorb any energy, it absorbs only the amount that can take it to higher levels, otherwise photons would just pass through with all its energy. Then explain please how is it, that electron(-4ev) can absorb +7ev although it only requires +4ev to reach the 0ev state??

[@pedrolopes4778]

Couldn't have said it better! Huge contradiction or something is missin in the explanation of the law, such as, if the amount of energy allows the electron to leave the atom, them absorbtion occurs. qed?

[@0909umcia]

@@pedrolopes4778 Free electrons exist. Thus we know there has to be energy that can free an electron.

[@tshiamo3524]

Perhaps because since the electron can absorb 7eV photon to move from 0 to 7 then it can still absorb 7eV again and be freed.

[@nonpareil7951]

Slight oversimplification but: Electrons in an atom can only have specific amounts of energy. However free electrons can have any amount of energy because the "leftover" is converted to kinetic energy that dictates how fast the electron is moving.
More details if anyone cares: A string under tension can have a standing wave, but only of specific frequencies- we call these harmonics. However sound waves moving through the air can have any frequency because they aren't bound to fitting into a particular geometry. The energy "well" that was illustrated with the analogy of the hole in the ground only allows certain amounts of electron energy. The wave thing is more than just an analogy. In quantum physics the electron is the result of a "wave function" that takes shape according to "spherical harmonics". These are basically the allowed waves that fit in the energy well. When it's not in an atom the electron can have whatever energy it wants.

[@yashaswikulshreshtha1588]

@@nonpareil7951 Yes I do care but I don't understand half of the terms and concepts like string under tension, harmonics, spheres etc IDK what're you talking about. lol I hate chemistry because people leave doubts like these, I like it because it gives a clear understanding of how things are working and you can your imagination.

[@Fin-by4tb]

The best video I've ever seen. Thank u soo much👏.

[@guessmynamelol5393]

Woah, this video turned from 0 to 100 real quick 🤯🤯

[@VASEA0000]

thank you, very informative and easy to understand, but please, drop the background music, it's distracting, especially with complex topics such as this.

[@pierret00]

You
You're right. Background music doesn't add any value.

[@Lico5512.]

I was laughing so hard when the beat dropped at "2 ev electron"

[@taaha6335]

It's lowkey relaxing stfu

[@mushi9766]

I like it

[@erikdejong4509]

Is there also a video on the calculations necessary to figure out the wavelength and frequency of the photon released, going from eV 10 to eV 2 for example.

[@skavitha3078]

Wavelength = h/√(2mE) And you can just google the frequency associated with the wavelength or the formula for that would be f=v/wavelength

[@jnanadas1250]

please make a playlist on atomic physics

[@nusratjahan510]

Really helpful

[@lelouchlamperouge8093]

*_Mr David_* you are so awesome !

[@cheraboutel7447]

I was about to escape the video , when I saw the energy levels positive values in the beginning , then I continued watching till the end to see , thanks god you pointed out the problem , well explained great video.

[@mege2991]

I wish we were taught this in school struggling through physics in school I always wanted an explanation in the exact manner it is taught here

[@japleensingh8143]

Lol true

[@njm-0819]

Good job.

[@thubelihlentuli454]

This guy is killing it

[@nazmaakter6656]

I am a Bangladeshi. By this video I have taught many new and interesting facts. So, thanks to Khan Academy.

[@TheGreatVerlin]

Thanks for this video 🥰

[@jopreijerink3969]

Very educative video! I only see one mistake. An elektron can absorb part of the energy of a photon and the delta in energy wil become a scattered photon (compton scattering)

[@shivanshsrivastav9037]

Wonderful explanation

[@meersamadkhan8910]

nice explanation

[@fareehawaqar8671]

Wonderful explanation 👍

[@PinkeySuavo]

I have already knew most of these, but it was a totally clear, nice refresh of information, with additional interesting facts. Very well done!

[@sweetypandy5286]

Very useful to me bro

[@christoffer1990ify]

The part where you explain the absorption in the start.. could you... make a big red electron ball 2d drawing and make it eat the energy as it "absorbs" or condumes.. I would have a great giggle...

[@anordinaryguy207]

Love your leaching

[@ashutoshpandey2577]

Awesome 👍😎

[@stefanopighini2825]

great job man!!!

[@muthuchami5618]

Super explanation

[@hidyatkey2success524]

It's just Phenomenal

[@firstlast9731]

Great video

[@lokeylokesh4744]

I love your teaching 😎

[@quantumaravinth]

First like for my favorite academy

[@adityamalviya1145]

great video

[@mahaelkiki]

amazing thank you

[@jazzy_gaming]

Thank you!

[@arnoldstephen5668]

great job

[@thedimpledoctor]

Thankew😊😊😊

[@robyn905]

amazing video

[@friedchicken1]

9:38 but I have a question. If the electron can only absorb a photon that will make it move to the next energy level, why can it absorb a 7eV photon? Shouldn't it be able to only absorb a 1eV photon to move to the -3 energy level?

[@abdulfattahhourani2942]

an electron can move mulitple levels at once if it is at ground state and it absorbs a 6eV photon can move 2 levels

[@kairulislam901]

Thanks a lot sir...

[@mariyaporumi8412]

Oh my God... U r awesome... I live it

[@gamespotlive3673]

This was a really based video.

[@papupradhan9920]

Explain to multiple electrons systems

[@tunistick8044]

THANK YOU SO MUCH

[@polashkhan8470]

Man, this video was a life saver

[@zubair1411]

Thank you... It helped me really a lot

[@Ashokc4]

Thanks a lot❤