IB Physics: The Atom
HTML-код
- Опубликовано: 26 июл 2024
- Explains the structure of the atom including energy levels, atomic spectra, the discovery of the nucleus through Rutherford's Gold foil experiment (Geiger Marsden). and isotopes.
150+ free and 70+ exclusive videos. 10% of proceeds to charity.
Click JOIN to become a member of C. Doner’s IB Physics RUclips Channel, or become a patron by visiting / cdoner .
IB Physics Topic 7.1
Level/Tier 1: $1.99 per month gives you access to a google sheet with a full updated, well organized, linked listing of all the videos and other resources such as notes, worksheets and solution sets.
Level/Tier 2: $4.99 per month gives you access to new videos. The new videos include IB style multiple choice and problem solving questions with full explanations, previews/reviews of the course content, and updates to the video lessons.
After becoming a member or patron, go to bit.ly/donervidlist and request access to the video listing.
"I would just like to say a massive thank you to you for uploading your videos. I started the IB [and]decided to try HL Physics as it seemed interesting. It turned out to be very far from my forté and I was consistently getting 3s and 4s in tests and mock exams. So a few months before the exam period of this year, I began to panic...Then I discovered your channel. For four weeks prior to paper one, I virtually worshipped your videos, and worked along to them in my 'Big Book of Revision.' Last week, I received my results. Incredibly and almost unbelievably, I obtained a 6 in HL Physics. Not only that, but I was 3 marks off a 7."
Table of Contents
0:00 Introduction
0:08 Structure
3:08 Discrete energy levels
6:10 Atomic energy levels of hydrogen
7:33 Emitted photons and spectra
10:14 tiny dense nucleus
11:50 Gieger Marsden (Rutherford) Gold foil experiment
16:29 nuclear names
18:50 Isotopes
20:14 Multiple Choice examples
23:36 Summary
U are my new God. Lord and saviour. Im creating a religion called Donerism
bill wurtz: "we could make a religion outta this"
Mocks are tomorrow, wish I could have found these videos earlier...
Reeeeally regret not choosing SL Bio right now :(
These videos are great, idk how to thank you, like these videos are free and sooooo effective compared to other websites or channels that need money such as studynova. thank you so much for such videos and I wish if you can solve some high level past paper questions and make videos about it.
Hey ! U done with ib?
@@romanempire3764 No, not at all. I took a break from making videos over the summer.
@@donerphysics i meant to ask him @adham...
Incredible video. Thanks!!
I love you
Thank you so much.
Always welcome
In your explanation of the Geiger-Marsden experiment, you said that the alpha particle is deflected when it is close to the nucleus because the positive charge on both causes repulsion, however you said "the electrons are too light to stop it". Why does the negative charge of the electrons not cause a significant force of attraction?
Gold nucleus is 200000X as massive, with 79X the charge, whereas the electron is whirling around at 100000 m/s, and is effectively a blurr of charge spread out over a large area from the alpha particle's perspective.
At 22:27 you mentioned that they have the same chemical and physical properties, would the existence of an extra neutron not mean a mass change, and hence different physical property?
Good of you to notice. Just the chemical properties are the same.
Sir, in order to excite the H atom from ground state to n=2 or 3, we just subtract 13.6 and the energy of the respective n. However, if we supply 13.6 eV then does the attraction between electron and proton equals to zero and the ions form?
If we add 13.6 eV to the hydrogen atom, the electron can be set free from the proton (just barely) so that ions form. It is not that the attraction is zero. There is still attraction but the electron will have enough speed (kinetic energy) that it will never return to the proton.
Why the ionization energy is written as positive shouldn't it be -13.6 eV ? (I am referring to the second 13.6 the first one already has it.)
I am unsure of the context but often it is conventional to simply write the magnitude of a number for simplicity.
Doesnt the potential energy follow the inverse square law?
The force falls off as an inverse square, but the potential energy falls as 1/r.
The nucleus is dense dense, tiny tiny. That's kinda cute.
Thank you. Please spread the word about the channel, become a subscriber or a member.
is the ionization energy of hydrogen the same as the ground state but opposite because hydrogen has only 1 energy level or because it is a general rule?
Normally, an electron will be in the ground state. The ground state is a negative energy since the electron is trapped in the atom. To set the electron free, we must supply energy, and we must supply just enough to overcome the energy trap.
@@donerphysics thank you sm, you have been eternally responding to me this last few days and its so helpful thank you
If we give it exactly the same energy as the level it is in it gets ionised
If we give it the difference between 2 energy levels it temporarily,moves to that energy level
But what happens if we give it more energy than its level but not quite enough for it to reach the next stage
The atom will only absorb photons with energies that match energy gaps within the atom.
@@donerphysics Thank you very much!
At 5:52 shouldn't it be 13.6 + 3.4 electron volts?
You have to rise from -13.6 eV to -3.4eV, so you need to add 10.2 eV to get to the next level.
@@donerphysics Ok thanks. Also what does quantization mean?
It means when there are only discrete values. Humans are quantized. We can have one, two etc. but we never get 0.23 humans.
@@donerphysics GOAT explanation. Thank you.
21:25 clearly 65 electrons 😂