Questions tagged [photoelectric-effect]

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

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Photoelectric effect question

I am currently working on the photoelectric effect. I had an idea that we could measure the spread of kinetic energies by measuring the current as a function of the voltage for a single wavelength of ...
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What is the difference between Luminous intensity and intensity of illumination?

What is the difference between the Luminous intensity and intensity of illumination? Please explain with units and dimensions as well! I googled but I partially understood it!
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How do you calculate the theoretical work function of an alloy?

Given a combination of metals or metals combined with one or more other elements, how do you calculate the theoretical work function of the alloy?
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Question on negative energy solutions to the photoelectric effect

the photoelectric effect was explained by Einstein as $$\frac12mv^2=\hbar\omega - W$$ where $W$ is the binding energy of the atom that the electron is in, and $\hbar\omega$ is the energy of the photon ...
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Why do we associate photoelectric effect with particle nature?

It is said that wave theory couldn't explain this effect and yet we shamelessly associate a frequency with light ($E = h\nu$) and call photoelectric effect as a failure of wave theory. Associating a ...
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What material properties determine a substance's photoelectric work function?

The photoelectric work function is the minimum photon energy required to liberate an electron from a substance. However, what are the properties of a material that affect its photoelectric work ...
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Problems finding some Sovjet references [closed]

I'm trying to find any of these references below. I. D. Yaroshetskii and S. M. Ryvkin, in Problems of Modern Physics (in Russian), ed. V. M. Tuchkevich and V. Ya. Frenkel (Nauka, Leningrad, 1980), pp....
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In photoelectric experiment, the frequency of incident light changes from red to blue while keeping the energy per unit area per unit time constant [closed]

Since I couldn't write the complete question in title: Effect of this change on saturation photocurrent? I had reasoned that since saturation photocurrent depends on intensity of incident light which ...
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What does Stokes's Rule explain in regard to photons?

What process does it describe and does it break the Conservation of Energy? For more details, Stokes's Rule is mentioned in Einstein's Proposal of the Photon Concept. His dissertation about Stokes's ...
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Is solar radiation at earth's surface sufficient to eject electrons from aluminum?

Is solar radiation at earth's surface sufficient to eject electrons from aluminum?
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Will the Average Kinetic Energy of ejected Electrons in Photo electric effect change with Intensity of Radiation?

Please realize, that I am not talking about the Maximum Kinetic energy of Photoelectrons. I understand that the Max K.E. depends upon the energy of radiation used. But the Kinetic enrgy of most ...
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What are the different driving forces behind a solar cell and how is a voltage created?

I have a hard time understanding the I-V curve of a solar cell. I dont understand how in an short circuit a current can happen although there is no voltage? Isn't voltage the requirement for a current,...
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What causes the photoelectric vs photovoltaic effect?

In the photoelectric effect, electrons are physically ejected from the material. In the photovoltaic effect, electrons are knocked out of their atomic orbitals but remain within the material. What ...
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Measurement of photon incident at an angle on detector

Let us consider an experiment where photons of some frequency $\nu$ are incident on a photo detector. Now, say the photons are incident at some angle $\theta$ with the normal, then the component of ...
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Phase difference between electrons emitted from a photoelectric setup of Cs

I read that electrons being emitted from a Cs plate when irradiated with photons with energy greater than work function of Cs, are used in a double slit experiment. But, should they not have varying ...
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Does this experiment VIOLATE Einstein's theory of photoelectric effect? [closed]

We will use two light sources of exactly the same frequency and emitting area in this experiment as shown in figure The distance of both the sources is adjusted to be the same (indicated as d) and in ...
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Frequency and intensity in photoelectric effect

In the explanation of photoelectric effect it is written that intensity and frequency of radiation have different results i.e. higher intensity means greater number of emitted photoelectrons and ...
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How is a Gold Leaf Electroscope charged negatively by induction?

I can't quite seem to get my head around this although this is what I think is going on: 1) To charge by induction a perspex rod must be charged positively, via contact with a cloth removing negative ...
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What happens when a photon impinges not in the space charge region?

What is the result when a photon doesn't hit the pn-junction? Can't it be lifted? From my understanding there should be valence and conductance bands everywhere across the material. Nevertheless, I'm ...
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Advantage of a photodiode compared to a photoconductor

Physically, a photodiode and a photoconductor base on the same principle: Lifting charge carriers from the valence into the conductor band. As this principle is already used in photoconductors which, ...
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Is the effect of frequency on saturation current negligible in the photoelectric effect and why?

I have looked at similar questions but have not seen this argument addressed. Since higher frequency light has greater energy, it should be able to eject electrons at a lower potential in the metal (e....
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Why Doesn't Thermal Radiation Render Thermionic Conversion Unable To Approach Carnot Efficiency?

Thermionic Conversion follows the classic Richardson-Dushmann Equation for thermionic current as a function of temperature squared: $$J_{RD} = A_0 T^2 \exp\left(-\frac{\phi}{k_B T}\right)$$ where $J_{...
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Failure of wave theory in explaining photoelectric effect [closed]

What property of waves makes it unable to explain to the photoelectric effect, and how does that property make the wave theory fail in explaining the photoelectric effect?
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Classical Wave theory and the photoelectric effect

I read that according to classical wave theory, light is viewed as a wave whose intensity is continuously variable. And for this reason, it is unable to explain the photoelectric effect. My questions ...
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Photo-Current vs Potential Graph [closed]

What I don't understand is that when we increase the value of potential why does the photocurrent reach a saturation point? Because when we increase the potential the velocity of the electrons ...
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Photoelectric effect: Beginning of the complexities [duplicate]

We are taught that in photoelectric effect if the frequency of light is lower than the threshold, then no matter how long a metal is exposed to it there won't be any ejection of electrons. This made ...
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What is the effect on charge of a metal when light frequency continues to increase above photoelectric work function?

For a given metal, light below a certain frequency will not eject an electron. Once the threshold or minimum energy is met to eject an electron, what happens as light frequency increases past the ...
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Photoelectric effect, work function and Kinetic energy range

In the photoelectric effect, why do emitted electrons have a range of kinetic energies? Is some energy just lost as heat when it is released from the surface of a metal and if so, why don't all the ...
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What does work function of metal exactly mean in photoelectric emission? [duplicate]

When a metal surface is illuminated with light of appropriate frequency so as to cause photoelectric emission, when does the work function of the metal come into play? Is it the energy required to ...
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in photoelectric effect, where do electrons go when they are ejected from metal?

When light shines on a metal, electrons are ejected from the surface of the metal provided the energy of the photons are greater than the work function of the metal. My question is: Where do the ...
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How current is produced in photoelectric cell?

In photoelectric cells, a current is detected when photoelectrons reach the electrode on the opposite side of the tube after being emitted. But shouldn't current be detected when photoelectrons leave ...
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Why is photocathode damaged by excessive photocurrent due to exposure to intense light?

Many books including the book (Hamamatsu, "Photomultiplier Tubes", link to PDF) says that a photocathode of a photomultiplier tube is damaged by intense light. Do not expose to strong light....
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Problem calculating Work function in Photoelectric effect

I'm having trobules understanding the solution of the following problem. In the problem we have a solar cell, which is impacted by a green light of $\lambda = 560nm$ and, as a consequence, there is ...
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Why does cutoff voltage in photoelectric graph remain same regardless of change of intensity and frequency of light?

Why does cutoff voltage in photoelectric graph remain same regardless of change of intensity and frequency of light I understand in intensity that minimum voltage required to kick off slowest electron ...
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Power consumption of phototubes

A phototube is a device that works by the photoelectric effect that generates a current For it to work, a potential difference is generally applied between the cathode and the anode of 15V, I only ...
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Why do photoelectrons from a vacuum photocell move towards the collector plate if it is not charged? Has it been charged beforehand?

Why do photoelectrons from a vacuum photocell move towards the collector plate if it is not charged? Has it been charged beforehand, or do they simply move forwards because of the kinetic energy they ...
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Number of electrons emitted by the photoelectric effect in a fixed material

in a material there is a quantity N of electrons, if light (of appropiate wavelenth) hits it, only the valence electrons will be removed from the material (photoelectric effect), how can I calculate ...
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Acceleration in photoelectric effect

In all the books I read, only the initial speed with which an electron is removed from a plate is mentioned, what happens to the acceleration? Consider a plate (charge neutral and not connected to ...
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Amount of electrons in a material?

Is there a way to calculate the amount of electrons in a plate of a certain material and certain dimensions? What I want to know is how many electrons are available to remove from a plate when light ...
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Kinetic Energy of Electrons vs Current in the Photoelectric Effect [duplicate]

Consider a setup of an experiment to measure the photoelectric effect. We have a photodiode which is linked to an ammeter and a source of voltage which can apply voltage in either direction. Let the ...
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In photoelectric effect, the plates have neutral charge?

Consider the basic schematic for photoelectric effect without battery Initially, light falls on a plate charging it positively (because it ejects electrons) and those electrons reach the other plate ...
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Power consumption in photoelectric effect

If I always want to keep plate A negatively charged and plate B positively, how much does the battery have to consume?(maintaining a constant flow of photo-electrons) as electrons are removed from ...
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Number of emitted electrons by photoelectric effect [duplicate]

I search in some post, and say that the number $N$ of emitted electrons is $$N=\frac{IA}{hf}=\frac{P}{hf}$$ but $f$ is for fixed incident frequency what happens if I want to calculate $N$ for a ...
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Why are the work function values for photoelectric emission different for thermonic emission?

I have seen equations like Richardson's equation and Einstein's photoelectricity equation thrown around, but is there a good explanation for why the means of where the energy came from results in (...
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Photoelectric effect in a a frequency range

I know how to calculate the kinetic energy of the emitted electrons $$KE=hf-\phi$$ And the number of the emitted electrons, but this is valid for a certain frequency $$N=\frac{IA}{hf}=\frac{P}{hf}$...
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Why is the parallel component of the electron momentum preserved when passing through the solid-vacuum interface? Why is the perpendicular not?

I am reading Surface Science: An Introduction and in the chapter about angle resolved photoemission spectroscopy (page 106) it says To consider the wave vector of an electron inside the solid $k^{...
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Can high energy photons produce more photo current than a bit more intensity of photo electrons?

If we take 2 case : Case 1: Very high energy photons and a bit less intensity Case 2: less energy photons but a bit high of intensity In both case ,both energy of photons are greater than the ...
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Photoelectrons could be detected in position space rather than momentum space?

In experiments, to study the interaction between atoms and light, experimenters use lasers ( i.e. coherent light) that interact with a gas of atoms. This treatment is pure statistics. To be more ...
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Emission of heat from absorption of light photon

So I've recently learned about photoelectric effect. It made sense at first, but when I try to combine it with what I thought I knew about emission and reflection of photon, things become rather messy....
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Can I generate an electron beam with photoelectric effect?

can I generate an electron beam with photoelectric effect? In short, can I replace an electron gun with the photoelectric effect? what i want to do is this, but with low energy electron beam

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