Photoelectric Effect Demonstration
Why Physics Stack Exchange recommends it
Physics Stack Exchange users link it as the concrete experiment behind questions about the photoelectric effect, and as a cheap demonstration to recommend for teaching quantum ideas.
Recommended by 1 people across 1 different months, 2019 to 2022.
What it is
A 3-minute classroom demonstration from the National STEM Centre showing the photoelectric effect, where UV light shone on a charged metal plate attached to an electroscope discharges it. It is presented as an illustration of the wave-particle duality of light.
What people said
Recommends Maxim Umansky · 2019-06 · Physics Stack Exchange · on “Cheap classroom demonstrations of quantum mechanics”
Photo electric effect is one of the corner stones of the quantum theory, and a simple demonstration of it is possible, e.g., [this video] Combining it with a demonstration of light interference and diffraction would be a fine demonstration of the quantum wave-particle duality.
Cites Science_Weeb · 2019-05 · Physics Stack Exchange · on “Questions regarding a demonstration of photoelectric effect”
I would like you to refer to this video for the question [this video] I have a few questions regarding the demonstration 1) Can I use a zinc plate extracted from a heavy duty battery. 2) Can I use conduction instead of induction as shown in video to charge the zinc plate. I will be using a PVC pipe rubbed with a paper towel to transfer negatively charge by contact. 3) Instead of the large ultraviolet source shown in the video, I would be using a small violet light torch shown in the picture, would it also work (It's violet even though it looks blue, I think it's 430 nm wavelength.)
Cites user248881 · 2019-12 · Physics Stack Exchange · on “How does photoelectric effect prove that light is also a particle?”
I was watching this experiment ( [this video] ) which demonstrates the photoelectric effect, but it does not make any sense to me how it proves light as a particle instead a wave. Can you please explain me? And I also want to know where exactly the electrons that are released by beam of UV light go.
Cites Ebi · 2022-01 · Physics Stack Exchange · on “Photoelectric effect for a positively charged plate in vacuum”
In the link below, to demonstrate photoelectric effect, an electroscope is positively charged, then a UV light is shed on the top plate of the electroscope which causes the repelling force of the gold leaves disappear. This implies some electrons are added to the metal plate and neutralised its charge (the electroscope was positively charged). Where did these electrons come from? One can say, the electrons come from air atoms, if this is correct, what will happen if we perform the same experiment in vacuum? Here is the video of the experiment (performed in the presence of air): [this video]