How to demonstrate electron diffraction in the classroom
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- เผยแพร่เมื่อ 26 ก.ย. 2024
- This demonstration shows that an electron beam is diffracted when it passes through graphite, showing electron wave behaviour and diffraction patterns.
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This is really good explanation! I watched many vids on youtube, including "big budget", and its the one here that explains the best. Its seems to be dedicated to other teachers but actually it made me understand the topic directly. Simple but fully detailed, no stupid music in the backgound, and a person who speaks clear to the point. This man here should make more vids.
I agree completely. His few physics demonstrations are the best I have seen on all TH-cam, through the 100s of crap I've had to watch to find the best for my students.
We (science teachers) need more vids like this. So many high school labs have old pieces of equipment sitting on shelves without a proper manual, instructions or even a nametag or description, so they sit there collecting dust. Untill this video i never knew our school even owned an electron diffraction tube!!
I'm using this video to show my nephew about the diffraction and also how bad education in Brazil is even on private schools. Nice video, Mr. Shaha. Thanks!
Thanks for the clear explanation.
the cameraman needs a raise :)
Such a nice explanation to what's happening apart from the theory part what we study. Thank you
Wonderfully instructive. Thank you! It does make me think though.....I'm not questioning the experiment/theory but it is philosophically challenging (to me anyway!): we can't "see" electron interference patterns; we see light. I get that the light is being generated as a result of electron impacts but the pattern we is light waves. The fact that here matter (e.g. a graphite wafer) is interacting with matter (electrons) gives rise to many questions.
superb video. good quality n excellent explanation. thks
Excellent presentation
a more important thing here is that a wave length gets shorter, the Bragg angle (theta) gets smaller. you can see the outer ring gets shrink with increasing the voltage, indicating 2dsin(theta) = wavelength
This is cool. Do you feel a noticeable resistance in the magnet? Also is the glass chamber a "vacuum"? I'm guessing it would have to be, or close to it, because otherwise it'd interact with air and you wouldn't get the wave like properties of electrons coming up.
nice explanation 👌
What if CRT emits just light like in LED which emits light also and not electron? It just happens that light in CRT has a characteristics that reacts visibly in magnetism. I saw it in other videos that LED light was also deflected by magnetism. While inside a conductor in a circuit magnetism rule and the propagated heat or light etc. energies thru diff. materials are the effect of this magnetism. Just a thought.
Thank you a lot 😊
Would you be so kind to demonstrate what happens when monochromatic light beam interacts with electrons-beam?
I read somewhere that Compton did this, and got the light in many different colors, but now I cannot find that text, and also I could not find on youtube that somebody demonstrates that.
Thank you in advance.
very nice teaching
thanks
Why the brightness increases ?
helpful video
Good work sir!!!!!!!
Good explanation.
Can you make a video on Youngs double slit exp ???
Hi my friend, I wonder if these video electrons are the same ones that pass through an energized coil?
beautiful
Don’t forget to tell the kids that this is how old cathode ray televisions worked.
HELLO ,WHY ITS TRAVELLING ACROSS THE TUBE ?
Thank you!!
0:45 why Graphite cause electrons yo be deflected ? Instead of Magnetic or electric fields ?
Ooh its atomic deflection
Brilliant! Just Brilliant!
2:30 nice thanks
Wow! First time I see this. Thanks !
Great.. thnx
amazing!!!
Nice 👍
why green?
nice!
Are dada darun video
Ar accent tao
beautiful
wow
Wooow 🤯
yo
The Earth is flat
This is not a diffraction pattern. This is just particles hitting an object and dispersing symmetrically from the impact location. This is the first ring. Then they fly off again and again to create cascading circles. They are all negatively charged so they repel each other and magnify this concentric circles effect. I could easily replicate these circles with a stream of negatively or positively charged plastic pellets. This is a complete sham. Is this your particle wave duality evidence?? Are you kidding me???? Come on. You must do better than this.
***** did i hurt your "particle duality" special-snowflake feelings?
Fantastic demonstration
Why do the electrons bend to the magnetic forces but light doesn't? I thought photons and electrons were very similar..
This is exactly what i needed.
Thanks Alom Shaha, for this amazing demonstration!
Good explanation.
Amazing
Dope.
Very good man you solve my question very easily 😅