Photoelectric Effect Demo
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- Опубликовано: 16 сен 2024
- This is a demonstration of the photoelectric effect using an ultraviolet source, a zinc plate, a Braun electroscope, an ebonite rod, and fur. The zinc plate is place atop the electroscope and charged negatively by rubbing the rod with fur and touching the rod to the plate. The plate is then irradiated by ultraviolet light and quickly loses its charge, as measured by the electroscope, as UV photons eject electrons from the surface.
This demonstration was created at Utah State University by Professor Boyd F. Edwards, assisted by James Coburn (demonstration specialist), David Evans (videography), and Rebecca Whitney (closed captions), with support from Jan Sojka, Physics Department Head, and Robert Wagner, Executive Vice Provost and Dean of Academic and Instructional Services.
Love from India
I found what I was looking for! Not reading definations and stuff
thats what education system in schools needed
Yah
@Javerson Goulart Filho in india too
@@05-harshitareddy42 crct
True
Thats exactly what they teach you in school . You just have to not bunk classes.
Awesome
Photoelectric sensors are also whats used in most modern day smoke detectors in residential and commercial/ industrial construction and renovation.
Eu estava esperanco um exploção, mas eu aprendi o que e o efeito fotoeletrico. Cool !!!!
Love from ODISHA
I'm from odisha tooo
I would suggest to show also that a common lamp is not able to knock off electrons from the zinc no matter for how long or strong it shines. Only wavelength short enough will so it. Otherwise nice video thanks
thank you so much that was incredibly useful
if u r not interested then just LEAVE .....watch netflix...scroll through social media for hours ....nobody is asking for ur opinions
.........in somewhere 1650s the concept of radioactivity was discovered and there were people like you who blankly said IT HAS NO USE IN REAL LIFE .....now the same concept is used in X ray machines , MRI scans , CT scans , AND TREATING CANCER PATIENTS .....Photoelectric effect has huge significance not only it proves that light has no wave nature .....it introduced the dual nature of light (IGNORE IF U WERE NOT SARCASTIC)
@@k-5999 what?
Good video 👍🏼👍🏼
very good explanation .Loves this video
Thank you so much 🙏💕
Great explained
T
Great thanks you from Nepal
Wow this is super cool to understand thank you sir😊🙏
very well explained.
Very nice explaination
Thanks you so much
This was awesome
Thanks a lot!!
Awesome 👏
Amazing sir !😀
Thank you 🙏
2:17 notice the fur 😱😱
Thank you sir.. It helped a lot
Loved it
love from korea
I'm not sure if I'm correct but I think the plate is not "negatively charged" but positively charged, since the rod was charged taken away electrons with the fur (so also positively charged). So the rod took away electrons from the plate.
Conventional current vs. electron current.
web.engr.oregonstate.edu/~traylor/ece112/beamer_lectures/elect_flow_vs_conv_I.pdf
Sounds About ✅
Hi sir if we pass the the threshold frequency through any electro magnetic field then what will be the result I tried solving and I got the equation as hVø^2=2hv`+k.Eø^2
Tony, you might take a look at my lecture video on the photoelectric effect, if you haven't already. ruclips.net/video/RqZ1_nzRYz8/видео.html
@@physicsdemos sir I don't understand what are you saying
I am simply pointing out that I have another video that goes into more detail on the photoelectric effect. You are welcome to watch it if you want more details.
@@physicsdemos I saw this but I have a point that if the threshold frequency is pass through any electromagnetic field then what will be the result .so I tried to solved it and I got the equation as
Ø^2hv=2hv'-K.EØ^2
And I got few more result that I want to discuss it personally so pls sir when you are free just say me we Will discuss because this the beautiful idea I got my life
Indians are watching these videos more 😂
Right bro
Yess 😂😂
Thanku sir
thats great
Nice demo. I study this in UK. Can I ask a question.
Why use zinc if it oxidizes? Most metals have similar work function values all around 4 eV.
Also is it absolutely necessary to pre-charge the plate? Can we not just let the photoelectons carry away negatives and leave a net positive which should also be observable on the electroscope? Thanks anyone.
PRE charge so as to bring the electrons to the surface of the metal to just make the effect more visible.....and only electrons get ejected in photoelectric effect ....
Did he explain it or performed the experiment?
did you watch the video?
❤
Where do those electrons go ?
1:46 How to they know electrons are getting kicked off, rather than mixing with particles from the light and being turned neutral, or something else like that?
Have they done more complicated experiments where they use detectors elsewhere that detect where the electrons go?
how can photon neutralise electron?
@@visweshshukla How can any particle do anything? They're all models. It's called the Standard "Model" for a reason. The existence and behavioral mechanics of these particles is inferred.
And while I'm grateful for videos like this, the experiment as shown does not necessarily imply what is claimed, it could have lots of interpretations. And obviously at one time it did have lots of interpretations, before the 1905 paper.
In order to get the interpretation, the model, that they have, they must have had more than this. I'm looking to learn about what those more thorough experimental observations were.
To turn it neutral the light particles/photons have to have a positive charge but they have been proved to be neutral.
You might ask how are photons neutral then? It's simple, light rays have not been shown to deflect in electric or magnetic fields and hence can be said to be neutral.
🤩🤩🤩🤩🤩
this is called education
Question please: if we continue shining UV light on the zinc plate, will the electroscope get charged again (this time with positive charge)?
Thanks for the video!
Yes...after enough exposure to the UV light the zinc plate will get some positive charge accumulation which can be seen by the electroscope...this is due to the plate ejecting more electrons.
Is the sun kicking out electrons of me?
Photoelectric effect lecture
Sir app hindi me nahi bta sakte h
Quantum ,planks constant,photons
1:19 Me, Friday night
Lol 😂
ruclips.net/video/v-1zjdUTu0o/видео.html
You stole it from this video, didn't you?😏
@@nayan7398 Yes, I stole it from that video. It is still applicable here too, that's why I used it. Sorry.
Sir hindi me explain please
Most of people here re indians
This is wrong think quantaam mechanis
Awesome
Thank you so much ❤️