Energy Levels & Emission Spectra - A-level Physics
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- Опубликовано: 2 июн 2024
- scienceshorts.net Please don't forget to leave a like if you found this helpful!
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00:00 Absorption, excitation & ionisation
03:08 Energy levels
05:45 Emission
09:13 Absorption & emission spectra
11:12 Fluorescent tube light -
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What a pleasant corner of RUclips
Welcome to the wholesomeness, friend.
oh?
@@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
Not going to lie, you make me want to keep on revising for my physics exams.
Me after teacher explained this: *de excitation*
Me after seeing this video : *excitation*
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.
Thank you!
@@ScienceShorts 50k subs in a year nice
not any more
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Your a really good teacher, i actually ended watching the whole video even though the answer i wanted was already answered.
Preparing for my ocr a2 physics on 20/05/19.
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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
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Thank you so much this cleared everything up so much
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Could not have explained it better thank you sooo much
great explanation, thank you!
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Thanks
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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.
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
I subscribed these vids are so helpful!
Thanks for the video, helped a lot.
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
Well done great explanation :)
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Now i actually get how a flouresent tube works... Ive read it multiple times but having it actually explained makes it easier
Very Helpful it was
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Thank you for the help
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!
Yup.
hey... thanks for all these superb videos
Btw do u hv a video on cool and hot gases line spectra
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!
5:03 he explains it with 3eV
go back to the video, he said if a photon of 3ev won't be absorbed
@@allanmathew7133 He doesn't, he only talks about falling short of the mark not exceeding it.
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.
Super useful!
Excellent!
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?
So is ionisation energy the same as work function?
Hey, cool vids and presentation.
Do hot gases and cold gases have anything to do with absorption and emission spectra?
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
Thank you
when the electron jumps to a higher sate is it jumping between whole shells, or between the subshells of its current shell?
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 🥰
Shouldn’t the ground state be -13.606 eV?
Hi great video! I had a question - if the photon has too much energy, will it be just ignored?
Yeah. If it doesn't have the right energy for the electron, the photon just "passes through"
hi, so the electron can somehow detect that the photon doesnt give it enough energy to excite and so rejects it? Or does absorb and release the energy?
great my guy
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.
Thanks very much for the help, the textbook doesn't explain this topic very nicely!
8:55 important. Also 10:55
Just a reminder for myself
Thanks man！
@@rayz8980 It wasnt for you
Thank you.
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 ?
Sir you are a 🐐
Hello great video. just wondering why the mercury gas has to be at low pressure?
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.]
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?
Nope - has to be exact! That is, unless it's enough energy to ionise it.
@@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?
hi there, just a question regarding 9:02 , why did you use E = to 5 eV? isnt the electron dropping from n= 7 to the ground state? and the energy when it's excited is = to the energy when it drops down? thank you
Charlie Kake-White because he was only calculating the wavelength of the photon emitted from 5eV to 0eV level.
In your example, if a photon had 6 eV and crossed paths with an electron, would it excite the electron to the 5 eV state or just pass straight through?
It would excite to the 5eV state as it only has 6eV s. For it to excite to the energy level above 5eV (in this case 7eV state) it needs exactly 7eV s. hope this helps :)
This is false, if the Photon doesn't have the exact amount of energy required to move up an energy level it will pass through, e.g If it has 6eV, as it isn't 5 or 7 nothing will happen and there will be no excitation
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
You said there would be more wavelength of light in the emission spectrum compared to the absorption spectrum, however, could electrons not be excited from a higher energy level than the ground state to an even higher one to produce the remaining wavelengths of light seen in the emission spectrum?
Skitzzy they would've de excited by the time another photon would hit it when its at the higher energy level. Basically, de excitation is instantaneous unless it’s at its metastable state
even so, more emissions would still be seen. Remember that the electron can dexcite through many routes, emitting a variety of different photons. For each excitation there is more than one emission (except for n = 1 --> n = 2 of course)
Thanks
Awesome.
Energy level for simple harmonic oscillator? What is the Energy associated with boson, spinless particles and electron? related to ground state energy...1/2hbarw
I owe you a lot
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?
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?
Yep
wouldn't the emission and absorption spectra have the same lines? what about excitation and de-excitation from intermediate lines: n=2, n=3.etc?
Hot damn a great video
what would happen if the atom was supplied with 6eV? would it just pass straight through as it can't get to the 3rd level or would it to go the 2nd level? (AS level)
if it goes to the second level what happens to the extra 1eV?
The photon just passes straight through, no matter what the energy of the photon, it must either exceed the work function or be exactly the right amount to excite the electron to a new energy level to be absorbed
Are these energy levels the same as the s,p,d,f orbitals?
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?
Yes.
Can you please make a video about Band Theory?
How do u find c=3x10^8 ?? Is it a constant of photons? Not sure where you got it from.
It's the speed of light bro.
is it the same method if we want to find electron temperature?
Are energy levels supposed to be negative as away from the nucleus is considered 0eV as work must be done in order to remove the electron, like how an infinite distance away from a gravitational field is 0 ?
It depends on what the reference point is. All that matter in the end is the different in energy.
@@ScienceShorts ok cool, thanks