Questions tagged [photoelectric-effect]

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

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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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How can a photon collide with an electron?

Whenever I study the photoelectric effect and the Compton effect, I have always had a question about how a photon can possibly collide with an electron given their unmeasureably small size. Every ...
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How does the equation $h\nu = KE + W$ account for the inability of electrons to exceed the speed of light?

To start, obviously, electrons cannot surpass the speed of light; however, the equation describing the kinetics of an electron hit with light with a higher energy photon than the work function, $W$, ...
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How does amplitude affect photon's intensity as a particle?

Considering the scenario were a photon acts as a particle, how does amplitude affect the photon? Does it increase its intensity? How do you visualise this?
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What is the origin of optical force?

In photoelectric effect a photon transfers its energy to an electron. Thus it does some work on an electron and work is always done via some force which in this case called optical force. I want to ...
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What would happen in a single slit diffraction experiment if the slit ends are made of photo sensitive material?

In a single slit diffraction experiment if the slit ends are made of a photosensitive material, And if a light wave falls on the ends of the slit, will it get diffracted or will it lead to ejection of ...
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Can we give direction to the electron released from the use of photoelectric effect?

I wanted to build an electron accelerator and wanted to isolate a single electron. So, if I provide right amount of energy to the metal, would I be able to isolate the electron WHILE making it move in ...
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Work Function - Photoelectric Effect

Does the work function of a metal take into account of the electron losing energy in the course of collisions with the metal atoms, or is it only for the electrons near/on the surface of the metal?
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A question about photoelectric effect (graph)

I'm convinced with the graph except for when x=0. When $x=0$, the collector is at 0 potential. So photoelectrons that are emitted from the plate are not influenced by any electric field. Since there ...
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What is the equation describing the relationship beteen photocurrent and voltage in photoelectric effect?

Keeping the intensity and frequency of light from the source fixed, the value of current in the circuit can be plotted against different voltage values, which look like this. Most textbooks on ...
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Why do we get lower voltage with smaller band gap and higher voltage with larger band gap in a solar cell?

It makes sense to me that if the band gap is smaller, we would get a higher current as more electrons will be promoted to the conduction band. However, I do not understand why voltage is lower. I ...
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Charge buildup in photoelectric experiment

Suppose I have a simple discharge tube to demonstrate photoelectric effect.There is potential difference across the electrodes i.e, 0V.Now if I shine suitable frequency radiation to knock off ...
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Confused over photocurrent [duplicate]

Suppose we have a simple discharge tube with two electrodes connected externally through ammeter and battery and evacuated internally.Now we shine radiation of suitable frequency on emmitter so that ...
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Saturation current in photoelectric effect should not be reached

I know that there are many similar question but I found none of them useful, so I am posting my own query. My doubt is that why should there be a saturation current reached in the experiments of ...
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Effect of collector plate potential on photoelectric current with varying frequencies?

The above graph is from my physics book which shows the effect of collector plate potential on photoelectric current for different frequencies. Inference from above graph: Since all the three ...
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Is it possible to create a photo-electron with 2 low energy photons?

We all familiar with the famous PE observation and Einstein's explanation. If a photon has energy less than the electron's binding energy, then there will be no PE observed. However, I am wondering ...
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Alternative metals for Photo-electric effect

I'd like to make a museum exhibit for the photo-electric effect. The classical demo, demands that a piece of Zinc be placed on the electroscope , then the electroscope is charged negatively then we ...
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How does photoelectric effect prove that light is also a particle?

I was watching this experiment (https://www.youtube.com/watch?v=v-1zjdUTu0o) which demonstrates the photoelectric effect, but it does not make any sense to me how it proves light as a particle instead ...
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In the photoelectric effect, how do you measure the kinetic energy of the ejected electron?

I have read in textbooks that the kinetic energy of an ejected electron in the photoelectric effect depends on the frequency of the incident photon. My question is, how exactly is the electrons' ...
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Metal Solar Cell

If metals experience the photoelectric effect, then why aren't they used directly in solar power generation, as opposed to expensive silicon cells? A better question would be, why is the quantum ...
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Terminology for photoelectric effect

I'm currently writing a report on the photoelectric effect and I can't figure out how to say what I want to say. Essentially, I want to describe it as a "binary system" or "on/off system" (in that ...
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Reflection of light on white objects

How do objects really reflect light? We all know that if light comes to an object some of it's wavelength would get absorbed by the object as the form of thermal energy, and some would be reflected ...
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Why does gas pressure affect work function?

A while back I did an experiment at my university in which I used high vacuum (about 10-7 torr) to measure the work function of a tungsten filament. We had to measure the partial pressures and ...
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Frequency plot with photoelectric current and anode potential

Keep your eyes near 0V anode potential - here you can see that the light with maximum frequency has more photoelectric current and that the light with minimum frequency has less photoelectric current ...
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Why can't an electron emit more than 1 photon when moving down from an excited state

Why is the following statement false? When an electron loses energy in making a transition from one state to another, energy is conserved by several photons being emitted. I don't see which ...
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Energy and momentum conservation in ARPES

In ARPES experiment we assume that electron's momentum in-plane component is conserved, while perpendicular component - NOT. This means what total momentum of electron |K| changes, which means that ...
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Definition of anode and cathode in photoelectric effect

I've read the definition of anode which is that oxidation happens there and thus electrons are leaving the anode. In photoelectric effect we radiate the cathode which is connected to the negative ...
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Some questions on the photoelectric effect

I was reading about the photoelectric effect and a few questions come to my mind. For the context, I read that if you shine some light (of high energy) on a metal, this latter will emit electrons. ...
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Concept of Maximum Kinetic Energy

What is the concept of maximum Kinetic energy of an electron when a photon is incident on a metal surface? Why the ejected electron can have a range of Kinetic Energy?
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How can I sample the solar spectrum to determine, in the vacuum of space, the frequency of a random photon?

I am working on improving a spacecraft charging model by simulating the photoelectric effect. To do so I need to determine the frequency of a random photon coming from the sun. How would I go about ...
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Linear dependence on photoelectric current

I have done a lab experiment in which we had to determine the Planck's constant through photoelectric effect. The equation reigning this experiment is: $$eV_c=h\nu-W$$ Where $\nu$ is the radiation ...
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Photoelectric effect in the context of double-slit interference

When sufficiently high frequency light hits a metal surface it emits electrons. Now what will happen if the light is coming through two slits and forming an interference pattern similar to the double-...
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Differing stopping voltage formula

$V_0 = hf - \phi_{col}$ In a lecture, I was give the above formula for stopping voltage. It seemed a little simplified and weird to me as the LHS is in volts but the RHS is in electron volts. I did a ...
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Why emission of an electron does not depend on light's intensity?

There's something that confuses me about the photoelectric effect. In an article I read, it's stated that the emission of an electron does not depend on the light's intensity. I'm not sure on which ...
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What happens to photon in photoelectric effect

In photoelectric effect, when the photon gives energy to the electron, then what happens to itself? Where does it go? For me the photon must take the place of electron after the electron escapes the ...
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The polarization filter does not work

I am working in Conduction phenomena Photo-conductivity Experiment. Here the experiment guide . The aim is to measure the photocurrent $I_{Ph}$ as a function of the voltage $U$ at a constant ...

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