# Tagged Questions

The observed behavior in which light falling on certain metals can eject electrons from the surface.

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### What actually happens when a photon is absorbed by matter?

In my physics courses so far we've only discussed the before and after of a photon being absorbed by matter. But what actually happens here? How does the light "meld" with the atom that it is incident ...
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### Compton effect in photo-electric?

In photo-electric effect Einstein said that photons incidents on material and gives their energy which will gives kinetic energy to electrons. But i also want to know that why Compton's effect not ...
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### Photoelectric effect and work function

In a photoelectric effect we remove electrons from a metal using high energy photons, the work function is the minimal energy required for this effect. My question is why doesnt the work fucntion ...
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### No photoelectron is emitted from which of the following metals?

So there was this multiple choice question in an exercise in a bookI'm reading. I know that the forum is about discussions. But I want to know what the answer to the question is and why it is so. ...
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### What determines photoelectric yield

Is there any difference between the photoelectric yield of different metals apart from the threshold wavelength? To be more clear: Will metals with the same work function emit the same amount of ...
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### Why work function is not identical to first ionization energy?

From Wikipedia: The ionization energy (IE) is qualitatively defined as the amount of energy required to remove the most loosely bound electron of an isolated gaseous atom to form a cation. ...
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In this problem: According to a model based on the electromagnetic theory of light, the electron absorbs all the energy that is incident on the surface within a distance of $5.0\times 10^{-11}\ \... 1answer 75 views ### Is there a relationship between kinetic energy of emitted electron and photoelectric current? I know that photoelectric current is dependent upon intensity of incident light. But it should also be dependent upon kinetic energy of emitted electron because mathematically$I=Q/T$. So if kinetic ... 1answer 63 views ### Why don't electrons dislodge with higher intensity? I understand that photo-electrons are not produced with increased intensity because frequency is what matters, however could someone give me a good intuition of why this is the case? What exactly do ... 1answer 42 views ### In the photoelectric effect, what happens to the electron if the work function is too low? I know that no electrons will be emitted from the atom if the threshold is not reached, but my professor is asking us what happens to an electron in this scenario. I asked if the electron would just ... 1answer 42 views ### Photoelectric effect on charged plate As far as I know, to observe the photoelectric effect, one has to expose a metal surface to high-energy radiation. But what happens if the surface has a surplus of electrons? What is the energy needed ... 1answer 46 views ### Thermionic emission I have a pretty basic question regarding the beam of electrons as a result of thermionic emission. In an electron gun, the emitted electrons from the cathode become incident at a point on the other ... 1answer 79 views ### How is work function related to oxidation? Low work function metals, such as Li and K, oxidize in ambient conditions, whereas high work function metals such as Au do not oxidize. In chemistry there's activation energy and reaction rate ... 1answer 49 views ### How to calculate the potential of a photocell? My guess is that because the wire is connected to a single point on the plate, we can treat it as a point charge and use the formula: $$V = k\frac{k(\pm q)}{|r|}$$ But I think there are different ... 0answers 57 views ### How to distinguish Shake-Up Satellites from Plasmons? I am studying XPS spectra (X-ray Photoelectron Spectroscopy) at the moment. In XPS, different processes can influence the final state energy of detected electrons. One of these processes is the ... 0answers 32 views ### Is measuring the speed of light using energy and wavelength cyclical? I would like to measure the speed of light by directly measuring the frequency and wavelength of a light source. In order to determine the wavelength, I wanted to use a diffraction grating and the ... 0answers 23 views ### Database for work functions for exotic crystallographic faces Is there a database, which holds work functions (found either from experiment or calculations) for some more exotic crystallographic faces, such as (221) or (311) for copper? I dug around and found ... 0answers 27 views ### How to measure the maximum kinetic energy of electrons emitted due to photoelectric effect? From Einstein's photoelectric equation, $$hf = \phi + k.e_{\text{max}}$$ where$\phi$is the work function of the metal. My question is : how to experimentally determine the kinetic energy of ... 0answers 42 views ### How much energy does a PV cell need to work? How much energy does a$1m^2$photovolatic/solar cell need to work? Can it work using a bunch of Laser lights? Edit: Ok so this PV cell is$1m^2$is dimesions. The N-type has silicon doped with ... 0answers 3k views ### What is the difference between photoelectric effect and Compton scattering? What is the difference between photoelectric effect and Compton scattering? These two effects explains interaction of photon with electron. Why in photoelectric effect whole energy of photon is used ... 0answers 1k views ### Intensity of light that produces largest current in Photoelectric Effect + Stopping Voltage Question For the first image: For the Sodium metal, the Current produced by the cell is the highest when shined on by 196nm light - Not the highest, why is that? What determines the intensity of the light that ... 0answers 133 views ### An electron is subjected to an electromagnetic field using the canonical equations solve So I was given the following vector field:$\vec{A}(t)=\{A_{0x}cos(\omega t + \phi_x), A_{0y}cos(\omega t + \phi_y), A_{0z}cos(\omega t + \phi_z)\}$Where the amplitudes$A_{0i}$and phase shifts \... 0answers 16 views ### Photoelectric effect and evanescent fields We all know that if light impinges upon a metal and if it's the energy of the photon (hv) is greater than the work function of the metal then an electron will become unbound from the metal and be ... 0answers 24 views ### Calculating saturation current and energy associated with a band of wavelengths Consider white light whose wavelength spread is from 400nm to 700nm. Its energy is uniformly distributed in this spectrum. The light is incident on metal A of work function 1.55eV. Saturation ... 0answers 55 views ### Why call it a particle and not a wave pulse? My physics textbook says that photoelectric emission provides conclusive evidence for the particle theory of light. Apparently, since photoelectric emission only works at certain frequencies, we can ... 0answers 35 views ### Photoelectric effect by cosmic radiation In photoelectric effect, energy of photons are used to remove electrons from the atoms of the metal. Generally, energy of the photon determines the photoelectric current produced. But nuclear ... 0answers 35 views ### Photon spin and photo electric effect If a photon with spin angular momentum$+1$with sufficient energy strikes an electron with spin$+1/2$, emission will take place. As angular momentum can't be conserved, what will happen? 0answers 8 views ### Solar cell using graphite I recently heard that single graphite layer is developed so as to produce solar electricity. Is that possible. If so, then how is that process takes place? 0answers 49 views ### Number of photoelectrons vs Frequency This is the graph plotted between photocurrent (proportional to number of photoelectrons) and potential applied with different frequencies. As it can be seen, the number of photoelectrons released ... 0answers 17 views ### How can I calculate the bipartition angle for photoelectrons produced by photoelectric effect? I'm taking a course in radiation physics and I'm studying the photoelectric effect. In the notes that he gave us my professor states that half of the emitted electrons are emitted forward with an ... 0answers 28 views ### Extraction efficiency in photoeffect I am looking at the extraction efficiency of the photoeffect (how many electrons end up in vacuum per photon). I have read in this forum that 1e-5 or less electrons make it outside of metal. Reason is ... 0answers 135 views ### Why doesn't saturation photocurrent depend on frequency of incident ray, keeping intensity constant? We know that intensity I = nhf, where n is no. of photons striking metal surface per second per unit sq unit area, and f is frequency of incident ray. In the book it was said that if we change the ... 0answers 39 views ### Does nature of light depends on its Time of Interaction? I was trying to understand how to "feel" about light. I have formed a notion which I couldn't find anywhere. So please tell if I am correct. Also please give theoretical explanations if possible (and ... 0answers 51 views ### Does tracing paper over a solar panel count as hard shade or soft shade? For my Physics IA I conducted an experiment to see how shade on solar panels affects the output power. I applied and secured one layer of tracing paper over the solar panels of my solar charger at a ... 0answers 90 views ### Why do we get saturation current in photoelectric effect So apparently if you increase the number of photons emitted per second to infinity, the photocurrent will approach a limiting value called the 'saturation current' I feel like we shouldn't get a ... 0answers 106 views ### Continuum Wave Function for the electron I'm trying to understand certain processes like the photoelectric effect and Bremsstrahlung. In Bremsstrahlung I need to use the wave function of an electron coming from the continuum, and there is ... 0answers 41 views ### Is my representation of$\varphi\$ Work function correct?

I am a middle-school so my understanding of physics may not be as solid as you professional physicists but never the less thought its worth a try to learn more. I read about photo-electric effect by ...