- published: 25 Jun 2014
- views: 143715
The photoelectric effect is the observation that many metals emit electrons when light shines upon them. Electrons emitted in this manner can be called photoelectrons. The phenomenon is commonly studied in electronic physics, as well as in fields of chemistry, such as quantum chemistry or electrochemistry.
According to classical electromagnetic theory, this effect can be attributed to the transfer of energy from the light to an electron in the metal. From this perspective, an alteration in either the intensity or wavelength of light would induce changes in the rate of emission of electrons from the metal. Furthermore, according to this theory, a sufficiently dim light would be expected to show a time lag between the initial shining of its light and the subsequent emission of an electron. However, the experimental results did not correlate with either of the two predictions made by classical theory.
Instead, electrons are only dislodged by the impingement of photons when those photons reach or exceed a threshold frequency. Below that threshold, no electrons are emitted from the metal regardless of the light intensity or the length of time of exposure to the light. To make sense of the fact that light can eject electrons even if its intensity is low, Albert Einstein proposed that a beam of light is not a wave propagating through space, but rather a collection of discrete wave packets (photons), each with energy hf. This shed light on Max Planck's previous discovery of the Planck relation (E = hf) linking energy (E) and frequency (f) as arising from quantization of energy. The factor h is known as the Planck constant.
Explaining the photoelectric effect using wave-particle duality, the work function of a metal, and how to calculate the velocity of a photoelectron. Created by Jay. Watch the next lesson: https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/bohr-model-hydrogen/v/bohr-model-radii-derivation-using-physics?utm_source=YT&utm;_medium=Desc&utm;_campaign=chemistry Missed the previous lesson? https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/bohr-model-hydrogen/v/introduction-to-light?utm_source=YT&utm;_medium=Desc&utm;_campaign=chemistry Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school ...
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eCHEM 1A: Online General Chemistry College of Chemistry, University of California, Berkeley http://chemistry.berkeley.edu/echem1a Curriculum and ChemQuizzes developed by Dr. Mark Kubinec and Professor Alexander Pines Chemical Demonstrations by Lonnie Martin Video Production by Jon Schainker and Scott Vento Developed with the support of The Camille & Henry Dreyfus Foundation
The photoelectric effect including how the photoelectric effect works. I use a fluorescent lamp black light for the ultraviolet light, a zinc metal plate and an electroscope for demonstrating it. Support RimstarOrg on Patreon https://www.patreon.com/user?u=680159 Subscribe for new videos every week http://www.youtube.com/user/rimstarorg?sub_confirmation=1 Go to the main channel page here https://youtube.com/rimstarorg For more in-depth detail about how the photoelectric effect works, see my webpage here: http://rimstar.org/science_electronics_projects/photoelectric_effect.htm See also: How to make an electroscope (DIY) https://www.youtube.com/watch?v=2PmWlPjV6n0&list;=PLFsZmHTZL-zn3jrI0X0e0aRijWlyvfg8h Triboelectric effect/series or triboelectricity https://www.youtube.com/watch?v=ey...
Something to do with photons and electricity. The emission of electrons from a metal surface when illuminated by certain colours of light has long been known about, but explaining why was always a challenge. This video shows why this can only explained by the interaction of individual packets of energy. Watch Part 2 of this video for an explanation of Einstein's equation: https://www.youtube.com/watch?v=apYFhps14-8 If you would like to see more A Level Physics videos then please Subscribe to my channel to keep updated with new videos and to search the Playlists already created. You can also visit my site 'A Level Physics Online' to see how all the videos relate to your course and for even more resources at http://www.alevelphysicsonline.com/ Thanks for watching, Mr Matheson
Look, up in the sky, it's a particle! It's a wave! Actually it's both. It's light! How do we know about this stuff? Well, because of Einstein for one. He did more than E = mc^2, you know. But don't stare at the sun to see for yourself, we've got science now. Subscribe: http://bit.ly/ProfDaveSubscribe ProfessorDaveExplains@gmail.com http://professordaveexplains.com http://facebook.com/ProfessorDaveExpl... http://twitter.com/DaveExplains General Chemistry - Online Tutorials: http://bit.ly/ProfDaveGenChem Organic Chemistry - Online Tutorials: http://bit.ly/ProfDaveOrgChem Science for Common Folk - Online Tutorials: http://bit.ly/ProfDaveScience4CommonFolk
Einstein explained the photoelectric effect in 1905, but the full philosophical implications weren't understood until the early 1920's. (Or maybe they still aren't...) Quantum physics is the only way to understand the photoelectric effect. So light comes in photons - little light packets. But they also have a frequency. So, that's weird. They're wiggling packets, I guess.
The Photoelectric effect helps to illustrate the wave-particle duality of Light. The National STEM Centre has more free teaching resources on the photo electric effect and light waves here: http://www.nationalstemcentre.org.uk/elibrary/search?term=photoelectric+effectℴ=score The National STEM Centre has over 8,000 free teaching resources available to all following registration. Registration is also free https://www.nationalstemcentre.org.uk/signup
A basic rundown on some of the important properties of the photoelectric effect. To be used by my AP students to remember a little about it prior to the AP Test
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.
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Download the Show Notes: http://www.mindset.co.za/learn/sites/files/LXL2013/LXL_Gr12PhysicalSciences_12_Photoelectric%20Effect_30Apr.pdf In this live Grade 12 Physical Sciences show we take a close look at Photoelectric Effect. In this lesson we describe the photoelectric effect, we explain the terms photon, threshold frequency & work function, we demonstrate the effect of changing the intensity of electromagnetic radiation when the frequency of the radiation is less or more than the threshold frequency and finally we discuss the dual nature of light. Visit the Learn Xtra Website: http://www.learnxtra.co.za View the Learn Xtra Live Schedule: http://www.learnxtra.co.za/live Join us on Facebook: http://www.facebook.com/learnxtra Follow us on Twitter: http://twitter.com/learnxtra ( E001978...
Visit my website for more Tips, Videos, DIY projects and more: http://www.mjlorton.com/ ------------------------------ Click "Show more" ------------------------------------------- A tutorial on how solar panels work, the photoelectric effect. I take a look at how different parts of the light spectrum and wavelengths of light effect different materials (solar panels) to produce electricity. Support me through Patreon or by using my Amazon Store: Patreon: https://www.patreon.com/mjlorton Amazon Store: http://astore.amazon.com/m0711-20 Or anything on Amazon: http://www.amazon.com/?_encoding=UTF8&camp;=212353&creative;=380557&linkCode;=sb1&tag;=m0711-20 ------------------------------ Click "Show more" ------------------------------------------- My new Website is now live, see it here: http://mj...
Visit my website for more Tips, Videos, DIY projects and more: http://www.mjlorton.com/ ------------------------------ Click "Show more" ------------------------------------------- A tutorial on how solar panels work, the photoelectric effect. I take a look at how different parts of the light spectrum and wavelengths of light effect different materials (solar panels) to produce electricity. Support me through Patreon or by using my Amazon Store: Patreon: https://www.patreon.com/mjlorton Amazon Store: http://astore.amazon.com/m0711-20 Or anything on Amazon: http://www.amazon.com/?_encoding=UTF8&camp;=212353&creative;=380557&linkCode;=sb1&tag;=m0711-20 ------------------------------ Click "Show more" ------------------------------------------- My new Website is now live, see it here: http://mj...
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12_Sci_Learn Xtra Live_005_Photoelectric Effect_Highlights_Learner video Learn Xtra Video Key questions and answers from our Live Physical Sciences Grade 12 show. Mindset Network Copyright Notice. ( E00176385 )