Energy Levels & Emission Spectra - A-level Physics

[@samuelmcdonagh1590]

What a pleasant corner of KZbin

[@ScienceShorts]

Welcome to the wholesomeness, friend.

[@DracosThorne]

oh?

[@frankdimeglio8216]

@@ScienceShorts Some say that WHAT IS the electron is not a fundamental PARTICLE, and that what is the photon is a fundamental PARTICLE. CLEARLY, this is unsubstantiated nonsense. Balanced inertia/INERTIAL RESISTANCE is FUNDAMENTAL with regard to what is the electron AND what is the photon, AS they are BOTH inherently, CLEARLY, AND NECESSARILY structureless ON BALANCE. ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). By Frank DiMeglio

[@Refract404]

Not going to lie, you make me want to keep on revising for my physics exams.

[@morgandavies7083]

I don't usually leave comments but this is a really well-produced video, the physics knowledge is also more in-depth than most of the videos I've seen on this topic. Suprised this channel only has 14k subs.

[@ScienceShorts]

Thank you!

[@em8136]

@@ScienceShorts 50k subs in a year nice

[@brokenbrain6380]

not any more

[@puddleduck1405]

damnnn 128k now haha

[@joshhampton7235]

@@puddleduck1405 you got ur A level on thursday too and are also cramming lmao?

[@themodishmegalodon4887]

If the world had more teachers like you teaching in our schools, then we'd all be noble prize winners

[@aaronlang9976]

Why is physics so satisfying? Every time I wonder about something with physics, there's a perfect explanation and that explanation just clicks inside my mind. Ahhhhh...

[@Elitea20]

Me after teacher explained this: *de excitation* Me after seeing this video : *excitation*

[@ileggaless8715]

my teacher literally forgot to teach me this and my qualifying exams are in a week.... And you just taught me at least a week's worth of lessons in almost 14 minutes. Your amazing. Keep it up.

[@hamsalexus6463]

not exaggerating.... but these videos made me understand things the my teacher take 2 hrs to explain and usually takes 2 to 3 classes to finish... in just 10 to 15 mins.... these are life saviour... I love physics ....and my teacher is a good teacher and I mostly understand him but sometimes it takes my teacher ages and sometimes it flies over my head a few times I thought of quitting physics.. thank you for making my life easier.....

[@littledemon1443]

Your a really good teacher, i actually ended watching the whole video even though the answer i wanted was already answered.

[@jake99-25]

Preparing for my ocr a2 physics on 20/05/19. You are the best teacher ever. My physics teacher at school spent a couple weeks on this I didn't get it at all, your 13 minute video on 2x speed (bit rushed for time!) cleared it all up. THANK YOU! omg!!

[@Sid_Kill]

This has to be the best explanation of this particular topic I ever heard,❤️

[@liamabbott4684]

This is an incredible explanation. Thank you so much. You’re a legend

[@PreeshaPrabhath]

This video is incredible. Understood a concept I’ve been struggling with for a long time in a matter of five minutes. This channel is brilliant

[@진유-l9p]

You are my life saver..... Your videos are absolutely helpful for students like me who study a level independently.

[@fullsendmountainbiker5844]

Oh my god I’m watching this at 10 at night before my actual A level physics exam and I finally fully understand this topic thank you! 😅

[@shimaasalah9355]

You are a legend! finally, I found someone who explains physics in-depth and it makes sense, Thanks a lot. I will pray for you to reach millions soon.

[@ebadhaider8601]

3:53 blue pen to green smooth

[@ScienceShorts]

Wow, I didn't even realise - complete accident!

[@maazabrahani3215]

thank you so much for making these videos. they are very helpful. they make physics so easy and a fun subject. thank you once again. love from Zimbabwe

[@SeerajG_]

I have my first paper for phsyics today. Your videos have saved me !

[@abbsterjonesy]

good luck, me too!

[@reecec8337]

yo howd it go

[@gabriellita7236]

Wow, you are an amazing teacher. Not only do you explain well you also make us students feel somewhat engaged as it is easy to understand the logic behind what you teach. Keep working hard and I hope you make a lot more subscribers.

[@suryannair4490]

this man is saving my life

[@StudyFocus-z6s]

I wish I had a great teacher like him in our school❤

[@mariaal-sibaai9224]

Could not have explained it better thank you sooo much

[@ShahbazPanezai]

WHEN WALTER LEWIN said : Teachers that make physics boring are criminals........ Mr. science shorts you have proved theoretically that you are the teacher that made Physics Interesting instead or boring so I guess that makes you the opposite of criminal which is probably a HERO.....

[@ayesharana9802]

This video was extremely helpful! Thank you!

[@zareent489]

Love your channel so much I can't even convey in words

[@TheMiniWumbo]

Absolute best channel for physics 2. GPA saver!

[@muhammadzaidbilal838]

Thank you for the wonderful (easy to understand and follow) explanation ❤

[@fernandofischer3725]

Excellent explanation. Thank you very much!

[@anshsoni3584]

amazing video!

[@jahanzebali589]

EACH AND EVERY VIDEO OF YOURS IS SO HELPFUL ! SO SO HELPFUL !

[@theodoroskyriakou4887]

You helped me a lot my friend. Thank you very much. Excellent explanations!!

[@arthurbosquetti]

thank you so much for this video, your teaching is just great!!

[@bekaemery2918]

Now i actually get how a flouresent tube works... Ive read it multiple times but having it actually explained makes it easier

[@fahad_hassan_92]

Your videos are really well made, the editing is on point

[@parthmody2142]

I think you missed out that if the electron is given 6eV of energy, it won't absorb the photon because energy levels are discreet, great video though, really helpful content!

[@allanmathew7133]

5:03 he explains it with 3eV

[@hollinstwesigye1801]

go back to the video, he said if a photon of 3ev won't be absorbed

[@Reggie-tf4ex]

@@allanmathew7133 He doesn't, he only talks about falling short of the mark not exceeding it.

[@Akgaming-tg5bq]

I was lost when my Physics teacher told me all this stuff and I started hating physics for a while. Tbh this vdo made my mind and changed it again😂. Thx sir your vdo is so helpful 🥰

[@fahimal-huq6867]

Great explanation sir.

[@amajdalaweyeh1582]

So good to be here watching . thanks

[@fiddlesticks6146]

UNDERrated!! tysm for this!

[@yoihenbath]

Thank you so much! You are great. I am from Manipur by the way !

[@Mirsab]

8:55 important. Also 10:55 Just a reminder for myself

[@incompletefragments]

Thanks man！

[@User-ei2kw]

@@incompletefragments It wasnt for you

[@UNKNOWNUSER01]

Thank you

[@Manjndnxjx]

Man i love u,u helped me so much,now I understand almost everything and i am able to do lots of exercises,thank you very much.

[@ScienceShorts]

+CapitainSwaag Thanks dude!

[@iliaselalami8598]

thank you very much sir for your teaching, I have mainly 2 questions : 1- (Fluorescent tube experience) when the electrons excite the gaz's electrons and after these electrons give back their energy by emiting photons, there should be a lot of different lights absorbed by the coating! Among these lights there are a group that won't be absorbed by the coating and there are some that will be absorbed. the coating's electrons will be emitting another bunch of lights so my reseaning is there will be a lot differents lights emitting (in differents slap of time) why do we see just one of them ? is our brain tricking us? 2- why after a electron absorb an energy they prefer to release it as soon as possible? my reseaning is there a loss of enegy somehow ! what the source of these loss of energy i don't now! Thank you very much in advance

[@MP-me5vl]

Your explanation is great Thanks

[@philipefranks7098]

Thanks very much for the help, the textbook doesn't explain this topic very nicely!

[@faip7064]

At 6:18, is there anything that prompts the photon to be remitted for the the electron to go down an energy level or is it a random process? Also, thanks for the video! It's clearing up a lot of small things that I couldn't quite place together.

[@sakeralabas8642]

it's pretty much spontaneous, the electron will almost immediately de-excite unless it has escaped the atom. The only thing that varies is how it de-excites, whether it goes straight back to the ground state or if it drops to an intermediate energy level first. I am not too sure what determines which path the electron takes when de-exciting though

[@zeroitedono2547]

your videos are really useful keep up the good work

[@ifeanyichukwuidoko6599]

Thank you.

[@AmayaJ2007]

Thank you very much ❤😊

[@irinacd2537]

great explanation, thank you!

[@MrChai74]

At 6:42 How about if incoming photon have energy at 6 eV ? Do the electron at ground state excite to 5 eV ? And how about remaining energy 1 eV where it's gone? Do they transform to another form of energy ? And what the remaining 1 eV energy will be? Thank you for your clear and nice presentation.

[@iamindythatguy]

Thank you so much! Really appreciate it!

[@emamakbar9206]

You make physics easy man, kudos💯⚡🔥

[@rafin5520]

Very Helpful it was

[@KJSGameing]

I've watched all these videos and I think you've missed out binding energy, also could you do a video on Fayman diagrams where you just show off all the ones we need to know and how to get to it.Thanks, loving these wideo

[@kasulavineethkumar3510]

Excellent!

[@ww2immortal240]

Sir you are a 🐐

[@Horamod]

Excellent, thank you!

[@NikV01]

Thanks for the video, helped a lot.

[@zacbaker1589]

I subscribed these vids are so helpful!

[@AM-hn7gj]

So is ionisation energy the same as work function?

[@KavehMoghaddam]

Thanks!

[@joshvir262]

video number 2. 2 days before exam

[@nicklol7878]

you are the best. keep up the good content

[@georgesmith8988]

When the photon passes through, is that what happens with glass?

[@Lucky5Million]

Thank you for the help

[@simongross3122]

Really interesting video, thank you. But it raises a few questions for me: (1) In your example with energy levels of 0, 5, 7, 8, if a photon with energy of 6eV is encountered, does it push an electron up to the 5eV state? What would happen to the remaining 1eV? (2) Since there are only a finite number of elements in existence and therefore a finite number of possible energy states, does this mean that light can only have a finite number of specific frequencies? If so, that would mean that there is not really a continuous spectrum of light. This seems wrong to me somehow.

[@jasiralam196]

I think you missed explaining the energy levels and bands in solids! Could you add that somewhere please? Thank you and quality content always appreciated and loved from you!

[@msa1117]

Yup.

[@aimeekyle4859]

Thank you so much this cleared everything up so much

[@xxmemestar69xx82]

Shouldn’t the ground state be -13.606 eV?

[@rbanerjee605]

So can an electron be in an energy level other than the ground state and if so, is this more likely to be ionised and leave the atom. Could it also move down the energy levels or is the process just very quick and assumed to start from ground level? Where does the photon go from here- after de-excitiation?

[@vaibhavjagatiya3499]

great my guy

[@siixtus]

General question abt the collision of electrons. So when an electron collides with another electron in the fluorescent tube, the energy of the knocked off electron from its energy level, is it kinetic energy? And if so does that mean that absorption energy (energy of photon absorbed by the electron) has a lesser magnitude than Kinetic energy? [Yes, I know absorption energy isn't a form of energy, i just used it as an adjective.]

[@pedroadonish]

Ok, but if an electron absorbs energy of and UV photon, why does it gives back only a visible photon?

[@RahelShleso]

Thank youu!

[@AliKhan-yj9yr]

You're the best sir!

[@wamz2932]

Hi great video! I had a question - if the photon has too much energy, will it be just ignored?

[@faarishaque9142]

Yeah. If it doesn't have the right energy for the electron, the photon just "passes through"

[@МаксимК-в2л]

Super useful!

[@a.human.]

I owe you a lot

[@akakakakakakakakakakakakakak]

Well done great explanation :)

[@azwadaziz1548]

I have a question ….From this explanation I can conclude that a fluorescent tube should not emit white light instead only a certain colour of lights because phosphorus atoms also have discrete energy levels so those de-excitations will emit photons of certain wavelengths and so we will get light of different colours ….In reality we acutally get white light ...Why is it happening??

[@gauthamemmanuel7809]

phosphourous' emission spectrum includes a wide range of colours,so the resultant light is white. Look up the emission spectrum you'll see phosphorous doesn't have one colour more prominent than others like other elements do.

[@ThriveNow123]

I understand that a photon will move up if it gains a photon but then won't it lose energy in the process of going up?? Plz explain

[@mgusa9372]

Awesome.

[@meranism673]

Should the gas inside of the florescent light bulb be ionized gas? if so, how the coming electrons interacts with the gas molecules electrons ? If not, how the coming electrons are passing through the gas ? Since we need ionized gas (plasma) to have electrons travel through the gas ?

[@nickjpj2436]

Love this explanation, thank you. One question - what happens if an inbound photon has 6ev? It has enough energy to jump to the 5eV level but there would be 1eV of energy left over?

[@ScienceShorts]

Nope - has to be exact! That is, unless it's enough energy to ionise it.

[@Rehanennit]

@@ScienceShorts Wdym by enough energy to ionise it? For example if it has 10eV it can go to the 5eV level and come back to ground state? Or will it not accept 10 eV?

[@r4z3fyre65]

Thanks

[@shanapoorni7340]

hey... thanks for all these superb videos Btw do u hv a video on cool and hot gases line spectra

[@Yaaaahnehhh]

Hey, cool vids and presentation. Do hot gases and cold gases have anything to do with absorption and emission spectra?

[@austinnicholson1233]

Yes they do partially, when cool gas atoms are absorbed by photons they excite and the gas atoms become hot , when they de-excite they cool down again. Correct me if im wrong i am only learning this myself for the first time

[@tupac212]

Hello, just wondering, what would happen if the energy of the photon was equal to 6eV? Would the interaction not take place, enabling the photon to go straight through? Or would the electron go to the 2nd shell and not the 3rd? And, if so, what would happen to that remaining eV, would it be emitted as a photon or what? Thank you

[@elic307]

So what's the rule for ionization? Any photon with energy greater than the upmost shell will ionize? And what happens to the excess energy? Is it tuned into kinetic energy of the electron? And if the energy of the exciting photon is within shell boundaries but does not match exactly any of the shell energy levels, will it just pass through without any interaction?

[@ScienceShorts]

Yes.

[@noor-qq4zc]

thanks so much for the clear video, but i just want to clarify at 9:11 where we got an answer of 250nm, this isn't visible light as visible light starts at 380nm, right?

[@ScienceShorts]

Yep

[@ch1shun]

Can you please make a video about Band Theory?

[@menskills6368]

So does that mean it’s wrong to say that Hg is ionized in a CFL ? Instead it’s evening excited ?

[@ScienceShorts]

As it's a metal, it's a blurry line between excitation and ionisation. Talking about it in terms of the latter isn't worth it seeing as de-excitation is happening, so for *conceptual symmetry* we go with excitation.

[@ScienceShorts]

If you get that reference I will heart your comment.

[@henryash413]

Is the ground state specific to an electron or is the ground state specific to an atom? Is the ground state just the energy level that an electron originally started from, and so it is specific to that electron? I.e. different electrons can each have a different ground state in the same atom. Is the ground state always the energy level denoted by n=1 or could it be n=2 or n=3 etc?

[@Aceman07]

Shouldn't the eV on the energy levels be negative due to the fact that we supply energy

[@ScienceShorts]

It doesn't matter, it's all relative.

[@saifalimuhannad2807]

How do u find c=3x10^8 ?? Is it a constant of photons? Not sure where you got it from.

[@ScienceShorts]

It's the speed of light bro.

[@clipHero369]

why the photon is released when the electron moves from n=2 to n=3?

[@炫-r9n]

What do you mean they excite electrons? The fired electrons excite the mercury electrons?