Time saver; Packs a lot of information into a short time while still easy to understand.
@samcoopermusic
4 жыл бұрын
Also gotta say, this episode was really Bohring.
@alineomg4304
3 жыл бұрын
Haha
@Fuvkthedevil
Жыл бұрын
Hahaha. Nice one
@atifashhabatif8391
Жыл бұрын
Nice one😂 but it wasn't
@artbyrana2575
Жыл бұрын
Dad jokes here 😂😂
@wajidsaleem7929
11 ай бұрын
lol truee
@santicruz4012
4 жыл бұрын
It's so cool that you cover every subject I'm currently studying. After every class I have, I watch your videos about it and they help me understand every detail even better
@stardust5169
3 жыл бұрын
Haha Same :)
@jeewoo7195
2 жыл бұрын
He knows a lot about the science stuff!
@Yogitarathor8386
2 жыл бұрын
. Good thenk
@RedManE36
Жыл бұрын
Engineering?
@subrina_williams
Жыл бұрын
Good for you they pop up after I do the test😢😂😂😂
@luguzman199
2 жыл бұрын
pov: you are here because you are studying for your chemistry final
@wordpc8943
7 жыл бұрын
I learn more from your videos than 50 minutes lecture of my college
@Syafl
5 жыл бұрын
Word pc you study it at college and i study it at school!!
@manalym2522
4 жыл бұрын
@@Syafl guess what! you will study it again in college
@Syafl
4 жыл бұрын
Manal YM 🙂💔
@seankrueger3848
4 жыл бұрын
You study it at college but im 13 were not learning about it so I’m studying it at home. And yes i do understand everything in the Video.
@sohamroy5234
4 жыл бұрын
@@seankrueger3848 Hey, I'm 13 too and I am learning it at home too. I actually found the concept in 'In Search of Schrödinger's Cat' by John Gribbin.
@mariannebiggs899
8 жыл бұрын
This is the only explanation of the Bohr atom I've understood. Thanks so much!
@jagruti_rs
6 жыл бұрын
Marianne Biggs so true!🌈🌟 Thanks professor!🙏💕👑
@PushpendraYadav-wh9lc
4 жыл бұрын
Plz try physics wallah also ... 🙃
@pramodrajak785
3 жыл бұрын
@@jagruti_rs by
@pratiksaha2592
8 жыл бұрын
he knows all about the science stuff THANKS!!!!!!
@aang7505
6 жыл бұрын
Pratik Saha Lmao I always thought it was “he known alot about the science stuff”
@DW-ul2xb
5 жыл бұрын
Mr.whatever, it was his own words
@abdulnazar8657
4 жыл бұрын
Wow!!! , even my teacher didn't explain like this. You are great Mr. Dave.... ❤ from india...
@Thias1997
6 жыл бұрын
This video really helped me understand Bohr and Balmer series more...I was originally only here for Balmer and found this by mistake but I'm so glad I stayed for you to cover both models. You're brilliant! Best of luck to you and thank you, it really helped me for PChem!
@luguzman199
2 жыл бұрын
this is more educative than my chemistry teacher's 45 minute lectures. thank you so much for this video!
@Sandeshinmedschool
2 жыл бұрын
Value of Rydberg constant is 1.0974*10^7m. While 2.17*10^-18J is the value for E0
@UhrBushaltestelle
2 ай бұрын
so made a mistake?
@taleahbailey9667
8 жыл бұрын
Your entire series is incredible. Thank you so much!!
@ProfessorDaveExplains
8 жыл бұрын
my pleasure!
@Lucky10279
4 жыл бұрын
It is really is. He's on my list of go to science resource recommendations.
@Saballl998
Жыл бұрын
You R the Bibel, Torah, Koran, and many more to my academic life🙏🏼
@funnyizer
3 жыл бұрын
Most other people take 2 hours to explain these concepts. This is now my favorite KZitem channel.
@scotthackney4747
2 жыл бұрын
Did anyone else get the correct answer for the comprehension question but with the wrong exponent? I got lambda = -1.094 x 10^-44 meters My values for the variables were as follows: E = -1.816 x 10^-19 Joules c = 3 x 10^8 meters/second h = 6.626 x 10 ^ -34 Joules
@SunitaKumari-yd2bw
4 жыл бұрын
This comment is from India. And hey I m a student of higher class and I like your explanation style........ Ty
@philipparanthoiene4892
7 жыл бұрын
Thanks heaps for your concise lucid and didactic explanations, all of them. :-)
@theresec6599
4 жыл бұрын
Thank you!!! My teacher never explained even half of that.
@HAmcNUTTY
7 жыл бұрын
Thanks a lot! So the circle of n=1 in hydrogen has a different distance between it and the nucleus then the n=1 in for example a iron atom?
@ProfessorDaveExplains
7 жыл бұрын
correct! because they have differing numbers of protons in the nucleus.
@HAmcNUTTY
7 жыл бұрын
Professor Dave Explains okay, thanks a lot!
@makro80
7 жыл бұрын
Thanks! now I can ace my quantum mechanics exam this coming spring lol
@comical_flask
6 жыл бұрын
If it wasn't for your videos I'd never understand this subject I love so much 💕💖💜
@flowerfullgirl_
5 жыл бұрын
When i am at the wave lenght explaining part i get: (wave lenght= 4.59 x 10^ -8 m) instead of (4.86 x 10^ -7 m).
@iamphenomenalone8780
4 жыл бұрын
Sir you miss last 2 emmison (n=5 pfund, n=6 Humphrey) sir I want to email you what's your email id?????
@ebrahim5836
6 жыл бұрын
ur better than my school chem teacher
@abdiwaliabdulahi9415
4 жыл бұрын
isn't the finally answer of the wavelength in the example negative become E = -4.08 * 10^-19 so the wavelength will be -4.86 * 10^15..... I love your explanation thank you so much for your help ☺️❤️❤️👍
@silhouette4926
Жыл бұрын
Hi i think am missing some bit info here. If the change in energy is negative why is the wavelength positive. At what point does the sign go?
@uawulf
6 жыл бұрын
Dammit!!! I feel sooo sorry for myself... I just only have 2 months for my advanced level exam... wish i found you earlier.... Your amazing sir!!
@sakshiagrawal2839
6 жыл бұрын
Kavindu Sureka you mean IIT?
@wolowizard4441
11 ай бұрын
why at 2:28 to 2:31 does the photon energy go from a negative to a positive? Is that because the electron is said to have lost energy so the negative shows this? Where as the number for the energy must be positive?
@diegos9537
7 жыл бұрын
Isn't the Rydeberg constant 1.097373·10^7 m^-1 ? why is it in Joules and with another number in the video?
@ProfessorDaveExplains
7 жыл бұрын
just a different version! they are proportional and related by planck's constant and the speed of light. used in different contexts.
@akshatkaushik16
4 жыл бұрын
Faster than me
@rainbirdp
4 жыл бұрын
Great video linking physics to chemistry. One thing puzzles me, though. We learned in electron configuration that each electron has its own place in a shell, subshell and orbital. What if a photon bumps an electron residing in 1s to 3p, but 3p is already full. Does the displaced electron kick one of the electrons out of 3p? And what happens to 1s that has lost an electron?
@FrostDirt
4 жыл бұрын
The photon will (can only?) hit the outermost electron (i.e. the highest energy level), so I don't think this is possible.
@Dynamitepp
4 жыл бұрын
one subtopic 5 min daily study one subtopic, in a month, covered whole semester this is time efficiency at the peak
@aymanboughanem881
6 жыл бұрын
Just one thing When he applied the rule How did the sign flip delta E was negative but wavelength couldnt be except positive. (I know im missing out on smthing so if somebody can point it out id be grateful)
@shubhsaubhagya1318
5 жыл бұрын
It's energy not wavelength
@divyanshgaurav3249
5 жыл бұрын
As photon is emitted so energy has to be -ve but wavelength of the photon would be +ve
@ugandaforever8942
Жыл бұрын
My dude. I'm gonna tell you a little story. I won a scholarship to Taiwan as a military so it wasn't normal. I recieved 2 months of study for the language and then all the main courses like physics and chemistry were in chinese. You are my hero.
@nirupamam2814
5 жыл бұрын
Really it's worth .... Saving time..You told everything in minimum time..You are genius..Thank you very much for uploading and sharing your knowledge.. YOU ARE THE BEST PROFESSOR IN THE WORLD..
@dalenassar9152
7 жыл бұрын
...About, how high can these energy level numbers (n) reach before the escape level (n=infinity)? I would guess it's quite small due to the tiny size of an atom. Thanks for the most excellent science series!!!
@Panthera9
7 жыл бұрын
I'm wondering about this too. I imagine that there aren't actually infinite energy levels, since it obviously does eventually get ejected, so I don't get what's meant my n=infinite. Is it maybe just a shorthand for "as it approaches a given atom's maximum energy level"? Damn good stuff though, I'm watching through a few of these videos.
@yashidixit1851
3 жыл бұрын
Hello sir can you please teach us chemistry according to iit jee syllabus please i really need that. I'll be very thankful to you if you do so
@pavankalyan-zi6ei
7 жыл бұрын
sir if hydrogen atom is excited than the atomic radius of the atom increases?
@ProfessorDaveExplains
7 жыл бұрын
hmm, well yes i suppose if it is excited to n=2 or higher the radius must increase, as far as i understand!
@chalapathirao6305
3 жыл бұрын
In my school 2days class you explained in minutes thanks for your teaching me and my friends also subscribed this channel
@skpshashank
2 ай бұрын
Sir, the difference btwn the energy of electrons of two orbits is given by the expression : [(1/Ef ^2) - (1/Ei^2)]Eo = [(1/Ef ^2) - (1/Ei^2)]13.6eV
@ArifKalluruthegreat
6 жыл бұрын
There is an another direct method to find wavelength of a photon , Taking Rydberg's constant to be 109677cm^-1 So then a different way to solve this question would be 1/wavelength = - 109677(1/6^2 - 1/3^2) = 9139.75 That implies , wavelength = 1/9139.75 = 1.0941 X 10^-6 m
@brendawilliams8062
Ай бұрын
409/904
@igotsth
6 жыл бұрын
He would have more views if the thumbnail didn't look sleepy. xD
@Amjjad
4 жыл бұрын
Is Rydberg's constant -2.179x10^-18 OR 1.9737x10^7? The former was used in this video and the latter is what my textbook have... How many Rydberg constants are there?
@ProfessorDaveExplains
4 жыл бұрын
i think it's like the gas constant, different values when based on different units
@salmauthmaan4954
4 жыл бұрын
I am confused kn the part about the Rydhberg constant. When I search for the constant online, it gives 10 973 731.6 m^-1. Why are they different?
@sirijanthakur
2 жыл бұрын
I dont get why the energy is quantized or fixed lol, how come its bot losing it by moving or ahowing angular momentum
@lucifershome
Жыл бұрын
bro explained a 1 hour lecture in 5 minutes that's talent right there
@brentube743
6 жыл бұрын
Excellent video. For the final question I got 1.094 x 10^-60. I imagine its units but I'm still not sure. What video would you recommend? Thanks
@WinsheinNaing
8 ай бұрын
Sir your answer is false.I calculated this question,and answer is 1.094×10^-16m.pl checking your answer.
@KY-xz9yb
3 жыл бұрын
3:54 Sir thank you so much for this. Just listening is not good enough. We need questions like that to solve to really understand.
@rylissanna6491
10 ай бұрын
is there a good explanation for why the electron energy is negative? I assume we only use the absolute value when calculating the wavelength because in that case we are only looking at the change in energy (plus wavelength would be positive anyways). But what is the actual energy of the electron, and not the change in energy when it goes through a transition? I know it has something to do with that is really the energy it takes to remove the electron from the atom itself, so how do we mathematically put this together with the total energy in the system of the atom? Not entirely sure if this question makes sense.
@MaryJane-j3f
Ай бұрын
Lord,I wish you were my teacher.Thank the lord for having someone like you PROF DAVE
@prashant0719
Жыл бұрын
*people saying they understand what Dave is saying better than how their teacher explains it*...... *me a grade nine who's here just to write for a small presentation on the Bohr theory wondering what a photon is*
@titidechdamrongwut1351
7 жыл бұрын
I promised to go through all your vdo. Clear explanation and yet have Q&A. Thanks a lot Professor.
@SifnafNiguse
11 ай бұрын
I follow you from Ethiopian country please explain more as we understand every single thing as we understand &do more examples
@TheYurubutugralb
6 ай бұрын
it's not so much that: the transitions to level 2 in hydrogen "just happen to fall in the visible spectrum" as it is that: our eyes evolved to detect those transitions (i'm guessing because the transitions to level one were too hard to handle)
@clementinaafreh8784
3 ай бұрын
Prof. Dave, thanks for the tutorials. I would like you to help me with how you had digits for the hc variables
@IcyShadows
6 жыл бұрын
I don't get it... If you have two electrons... One electrons drops a level, emits a photon. The other electron adsorbs the photon, get bumped a level... then drops a level, emits a photon, and the original electron absorbs the photon it originally emitted... At that point no energy is lost. That can't be!
@ProfessorDaveExplains
6 жыл бұрын
why would the original electron re-absorb the photon? highly unlikely! it emits a photon to be absorbed by some other object. but also, don't forget the law of conservation of energy. if we look at the whole universe as a system, we should specifically expect that no energy be lost overall.
@ThtGurlFashionista
3 жыл бұрын
Why does the energy gap decrease as n increases? Still confused about that
@ProfessorDaveExplains
3 жыл бұрын
Because the electromagnetic force drops off by the square of the distance.
@mxoeneod90
3 жыл бұрын
@@ProfessorDaveExplains forgot to mention
@nobarakugisaki_._
3 жыл бұрын
You can also understand it by thinking that-" del E is inversely proportional to the square of n " Del E~ 1/ n'² { n' is ( n final )² - ( n initial )²}
@juliadeyanova1238
7 жыл бұрын
You're my hero!
@disonaroaurelo
7 ай бұрын
The idea of appears and appears elsewhere seems very strange to me, in fact an empty gap. Where there are no explanations that at certain times the electron may simply have less mass and at other times simply having more mass.
@txominpenasantacruz2472
2 жыл бұрын
I invite you to consult (simple atomic oscillator) and (Atomos de Santa Cruz)
@kripashankarshukla4073
6 жыл бұрын
Sir why is the potential energy of an electron quantized?
@ProfessorDaveExplains
6 жыл бұрын
ah the million dollar question! so do this, check out my clips on waves and standing waves in the classical physics series. then, check out my clip on quantum mechanics in the modern physics series. then all shall be revealed!
@kripashankarshukla4073
6 жыл бұрын
THANK YOU SIR FOR APPRECIATING MY QUESTION!!!
@siddharththayil122
7 жыл бұрын
Thank you so much Professor Dave. I am a student from India. Very well explained.
@pavankalyan-zi6ei
7 жыл бұрын
sir can u make a video on exitation of electron using Quantum mechanical model?
@ProfessorDaveExplains
7 жыл бұрын
i've got a modern physics course coming soon that will cover all kinds of weird stuff like that!
@everythingok9434
3 жыл бұрын
Awww.. Tysm.. Your videos are helping me a lot, 🤑🥳🤩😎🤓
@deeshikayadav7675
6 жыл бұрын
Too good I can't explain
@jamar117.
5 ай бұрын
Where is that -R sub H number coming from? How is that calculated?
@MsPslater
2 жыл бұрын
My teacher uses 1/wavelengh =R (1/nf^2- 1/ni^2) R=1.097x10^7. We got the same answer without converting from Joules. I need to learn your way too.
@sarbanisarkar8748
Ай бұрын
3:08 I play a game about exploring space, so my analogy is: Let's say you have a spacecraft orbiting at a certain distance from the center. You can raise the apoapsis however you want. To get a parabolic escape, you only need a finite amount of energy, after which you end up in a hyperbolic trajectory and have a 'speed at infinity.' Note: This is meant as an analogy and not an actual representation of what happens.
@jamdimon
8 жыл бұрын
For the checking comprehension what number did you use for the wavelength? Was it the number we found to be the Joules of energy? I get that H is planks constant and c is the speed of light
@ProfessorDaveExplains
8 жыл бұрын
we are solving for wavelength!
@AndreeaCe
3 ай бұрын
In one of my digital remains about Bhor Model, that I had to present at physics class in high school, as reference I noted that I used Wikipedia, back then there was only an English version on Wikipedia about it, so I had to translate from English to my native language. When I had to present in the front of whole class, I had some lost in translation issues. My professor asked me from where the tangling in wording, to which I told her that I had to translate from English from Wikipedia. But I didn't used only Wikipedia, I used also a University manual, which I forgot to put it under reference...well I passed through like 3 university manuals, wandered around the internet, and stopped at Wikipedia to pick some info from there as well. Made a world document about Bhors Model, put it on my external hard drive, went to school, and voilà. Back then Visa was still a thing...even my physics professor had it installed on her PC in her class... Read that again: - Bhor Model - World Document - Wikipedia - Windows Vista ... Hi Vista ;), no, I am not mad at you... You wonderful little dragon.
@AndreeaCe
3 ай бұрын
I just took a screenshot of something of how this learning machine is trying to hide something.... It's related to some idiots...
@superjakeyo7559
2 жыл бұрын
wouldn’t n=infinity technically be impossible because of the plank length? Because at a certain point the gap between n’s would get so small it would reach the plank length. Or am I miss understanding something?
@NakasDougen
7 жыл бұрын
Why doe the model break down for atoms of other elements ?
@ProfessorDaveExplains
7 жыл бұрын
electron repulsion complicates the math
@arisberbar9627
3 жыл бұрын
for the last exercise you made a mistake concerning the rydberg constant beacause firslty you are calculating the energy not the wave lenghth so you have to munchen there E0*Zeff V2 ,THEN AFTER when you calculate the wave lenghth you do the rydberg constant in the equation .
@arisberbar9627
3 жыл бұрын
although the final answer is true but the first step which is false
@velkine7259
Жыл бұрын
Im having trouble with the conversions from energy to wavelength. why not just use v=E/h to get frequency and then c/v= to get wavelength? why does proffessor daves calculations show speed of light multiplied by planks constant over energy? please help.
@velkine7259
Жыл бұрын
nevermind i get it
@SaudBako
5 ай бұрын
3:45 gives an amazing example of the usefulness of this model. 3:50 reminds me why I hated school. Of course I ask that very comprehension question every time I look at the sky.
@secretaryfig5364
3 жыл бұрын
GODDAMNNN DAVE, EXPLAINED THIS COMPLEX FOREIGN CONCEPT LIKE CAKE
@reluca81
6 ай бұрын
At 2:13 shouldn't the formula be 1/lamda =Rh(1/nf^2-1/ni^2)?? And the Rydberg constant is not Rh=1.097x10^7 m-1? I am so confused...
@reluca81
5 ай бұрын
@@karhukivi Thank you. I figured it out from another video. I just found the formula in Serway's book and there was no mention about the R having different measurement units.
@navyammo3180
4 жыл бұрын
All hail our lord and saviour Professor Dave!!!!
@mabvutobanda3829
4 жыл бұрын
I have this question which assumes to have an element that has one electron just like hydrogen but it has so many energy levels. So according to the energy associated with the removal of an electron, will this element emit more energy than hydrogen or what and why? Here is my line of thought, I was thinking it will emit less energy because of less attraction between the nucleus (assuming that an electron will be in the lergest energy level) and an electron but again if we are to remember properly since there is only one electron, it will be in the n=1 shell to acquire the lowest energy state. This is what confuses me, I don't know what to do or is it my opinion which is not ok. Your response will be highly appreciated 🙏.
@samarthpatel3916
11 ай бұрын
What about radius and velocity .does that not include in this model?
@crycry4441
6 жыл бұрын
For my final exam,I learn a lot from you .thank you so much!!
@CH-ek2bm
4 жыл бұрын
I don't understand how you've got from the penultimate line to the last line. Surely putting in a negative value for E would give a negative value for l (although l has to be positive) as h and c are both positive?
@silmarillion_80085
8 ай бұрын
This guy explained more in 5 minutes than my teacher did in 30 pages and 1.5 hours of lecture
@BrianSarmiento-im1zo
3 ай бұрын
woah. wait, wait wait... you've been wearing that for how long?
@kosiokoye2384
7 жыл бұрын
it actually E=hf and E=hc/lamda because f=c/lamda... (am using lamda cos my phone doesn't have the symbol)
@FrostDirt
4 жыл бұрын
Professor Dave, I think 3:00 is slightly inaccurate. The energy needed to eject an electron is indeed finite (just take the limit as n approaches infinity in the Rydberg's equation), but the distance from the nucleus to the shell that corresponds to n = infinity is infinite, as given by the Bohr's radius: r = a_0 n^2 where n is the shell number. I think you just got mixed up, great video nonetheless.
@ProfessorDaveExplains
4 жыл бұрын
No, of course the distance to n = infinity is finite, otherwise electrons could never be ejected from an atom.
@wastman9762
17 күн бұрын
What if energy of photon doesn't match with energy gap?
@spyrex3988
9 ай бұрын
its like a perfectly crafted engineering marvel similar to transisters
@joshuasauchak485
2 жыл бұрын
the value for rybergs constant is 1.097x 10 to the power 7 m-..... then how did put other value i dont get it
@Marco-it2mr
2 жыл бұрын
He should have used "Ry" rather than "R(H)" - the former is the Rydberg constant in terms of energy: Ry = h*c*R(H)
@bisharofarah950
2 жыл бұрын
why is the final answer positive if the energy is being emitted?
@NextgenBeast93
5 жыл бұрын
You must be really intelligent to understand any of this. It's interesting but it's over the majority of peoples heads.
@jendaen4128
3 жыл бұрын
so if i am trying to determine the energy of an electron with n=8 in a hydrogen atom? no changes what formula should i use?
@017kamakshisharma7
6 жыл бұрын
You make me love chemistry...
@exciton007
2 жыл бұрын
What is the relationship between this hydrogen energy levels and the atom configuration of all the elements?
@amerajama4006
8 жыл бұрын
YOUR VIDEOS REALLY HELPED THANK YOU SO MUCH !
@mamatheshkumar5711
3 жыл бұрын
cirumference of electron configuration =area of atom × diameter.
@klmoves
7 жыл бұрын
you're the best!
@elaafalmalek7401
4 жыл бұрын
Idk how u got the final answer I didnt get the same...
@zanyunimo4255
3 жыл бұрын
I'm so confused. I can calculate Energy but what are the variables h and v? how do I solve for them?
@ProfessorDaveExplains
3 жыл бұрын
h is not a variable, it's planck's constant, and v is frequency
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