Electron Energy Levels and Photons - IB Physics

I explain electron energy levels, what it means for electron energy to be quantized, what must happen for an electron to jump to a different energy level, how to find the possible energies of photons emitted and absorbed by atoms based on their energy levels.

0:00 Negative Energy
2:06 Electrons and Negative Energy
4:23 Vocabulary
5:41 Quantized Energy
6:35 Notation for Energy Levels
7:14 Photons and Electron Energy
9:32 Finding Possible Photon Energy
12:36 Frequency and Wavelength
12:57 Example 1: Frequency and Wavelength
14:55 Example 2: Proportional Reasoning
16:38 Example 3: Absorbing a Photon
17:10 Example 4: Calculating Energy Levels
18:25 Extra Notes

[daenahblackley]

Honestly every other video could not explain this enough that I could understand this concept. Thank you

[mariaparrales]

Hey Mr. Masley! I just wanted to say thank u so much for your videos! They are SUPER helpful especially during online school. My entire physics class watches your videos. You’re awesome and have helped me so much this year in physics!

[Govstuff]

I have only listened to 2 of your lectures and have been blown away at how well you get the point across. Awesome job. I don't know if you like Richard Feynman or not but he was quoted to say " If you can't explain a thing in common language then you don't understand a thing. " You are sensational. Thank you for the help. I'm 71 years old and just learning physics as a hobby and find my mind blown away when I get a great lecture. Physics doesn't have to be complicated!

[elibardash]

also im a big fan of the new setup the oval facecam is a neat touch and it has the iconic, , , draping??? behind it. 11/10 quality physics video very cool Mr Masley

[garymcleod]

18:25 Wow, I can't believe how fast I learned this. Your pace and delivery fits my thoughts process perfectly.

[georgia]

THANKS ANDY YOU SAVED ME AND MY FRIEND FROM FAILING CHEMISTRY

[nianlongxu]

Andy, this is great content!! i do not understand why you have not gained much attention

[sohamkatewale]

Can you please please do HL physics as well. Finding your videos was the best thing that ever happened to me and the way you explain concepts is just amazing. There are other good IB Physics lecturers online but your videos are perfect for me. Please make HL videos as well, they would be immensely helpful.

[BlindfoldedSight]

Cool stuff more relevant than people think. Also this is how we figured out what other planets are made of based on which photons were emitted through a prism. Take a molten hot material and see what light emanates through the prism and we can determine what atoms are present

[tainamoore]

This video was extremely helpful. Before this I knew nothing lol Thank you!

[samiajesinahona]

Truely! It is a worth watching lecture. Thank you sir.

[gwangjongchung]

Thank you so much for the videos! I was just wondering are you planning to make videos for HL topics too?

[arjanv.]

Thanks for this completely clear and relatively simple explanation! The catch for me was however at the end of the story. As there are infinite energy levels, the electron would have to absorb an infinite number of photons to leave an atom?

[IsaacsTM]

Andy great channel - and you are answering questions. Very cool. I've got a question. Assume a photon is emitted from the dropping of an electron from a higher to a lower energy level, if you detect or view a photon and the measurement causes the wavefunction of the photon to collapse into a particle, and given that this collapse goes "back in time" (per the double slit experiments were you observe the photon after going through the two slits), does that impact also cause the electron wave function at the atom, the electron being the entity that created the photon, to also collapse? Could this be true and would this mean that whatever you look at, the wave function of the electrons of the atoms of the item you are looking at becomes "real" (wave function collapses) while you are looking at it? And then after you look away, does the electron wave function start to rematerialize and move back into a wave function form rather than a particle form? There also would seem to be a timing issue as it takes time for the photon to travel to you but the impact of the wave function collapse could go back in time to perhaps cause the electron wave function to collapse at the time it created the photon rather then when you actually see it. Thoughts?

[_Junkers]

If electrons can only absorb specific wavelengths, how does an element like carbon absorb a broad range of light? E.g. if I shine a laser on a sheet of carbon, it will still get warm/hot

[maheshdharamkmable]

Hey Andy,
Is there any way i can get these ppts for teaching my class ?

[rudefrog]

I understand that the electron would not go closer to the nucleus if there are other electrons blocking its path, but what about the first shell, why do the negatively charged electrons there not go any further towards the attractive positive force of the protons? What force is acting on it to give it an equilibrium state in that shell?

[kisho]

How can the amount of energy in an atoms subshel (s, p, d, f) per period (1, ..., 7) be calculated?

[annmatt]

All energy levels have certain number of electrons it can hold like 2, 8, 18 ... If an electron is excited from n=3 to n=4 by absorption of photon, will it come to n=3 or n=1 when the electron is de-excited?

[brucedalzell]

Very good, but could you correct the units for the acceleration due to gravity, g, to be in m s-2 rather than m s-1