Questions tagged [photoelectric-effect]

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

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To grow one $\rm m^2$ of crop plants, how many $\rm m^2$ of solar panels do you need?

In vertical farms you need to use LEDs to make plants grow, which in turn have to be powered e.g. by solar panels. If solar panels had the same efficiency as plants, then you would need the same ...
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Excess energy in photoelectric absorption

In photoelectric absorption in semiconductors, the threshold energy $E$ of an incoming photon is given by the bandgap energy of the material $E_{bg}$. So for $E \ge E_{bg}$, the absorption is possible....
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Force exerted by light on a differential surface

Note: This is not a homework question I simply would like to understand how force is exerted on a differential surface and the question rose up in my mind while solving this problem. Suppose a ...
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Does ionization and the photoelectric effect require a specific wavelength of light?

I understand that distinct absorption/emission spectra occur due to electrons requiring specific amounts of energy, and therefore specific wavelengths of light, to move between specific excited states....
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How come electrons (spread out like a wave) can be ejected by a photon?

The photoelectric effect suggests that photons (of frequency more than the threshold value) collide with the electrons and they get ejected. But knowing the Uncertainty principle which suggests that ...
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Photoelectric experiment explaining particle property of light [duplicate]

How does photoelectric experiment prove the particle aspect of light in opposed to be solely wave-like?
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Relating exposure time of a camera to number of photoelectrons

How can we relate the exposure time of a camera to the number of photoelectrons created on the detector? We know the power and the wavelength of light hitting on the camera, quantum efficiency of the ...
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Why does stopping potential remain same on increasing power of Light Source

My question is that Power, which is energy per unit time P=Nhν/t as the formula suggests, can be increased in two ways, increasing no. of incident photons or increasing frequency. If we increase no. ...
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Why does stopping potential remain same on increasing power of Light Source( photoelectric effect)

My question is that Power, which is energy per unit time $P=\frac{Nhν}{t}$ as the formula suggests, can be increased in two ways, increasing no. of incident photons or increasing frequency. If we ...
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54 views

Photoelectric Effect and Acceleration

My question relates to the photoelectric effect. Namely: why is a photon not produced by the photoelectric effect? If an electron gains a certain amount of kinetic energy from the incident photon, do ...
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Why does photocurrent need $G^<$ among other Green functions?

In this highly-cited paper (or its pdf) on photoemission, Eq.(3) gives the current density in terms of $G^<$ $$ {\bf j}({\bf r},t) = 2\hbar\left( \frac{e\hbar}{2m} (\partial_{\bf r'} - \partial_{\...
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Why doesn't the work function being sensitive to surface not break the conservation of energy?

I understand that the work function is sensitive to the surface. But I don't understand how that doesn't violate energy conservation given the following scenario: Suppose there are two electrons at ...
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According to Maxwell wave theory what would be the exact relationship between the light beam intensity and the stopping potential?

According to Maxwell wave theory , what would be the quantitative relationship between the light beam intensity and the stopping potential in a typical photoelectric experiment (Millikan one for ...
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Photoelectric effect and space charge

I recently studied about photoelectric effect. My online teacher said about space charge that- after the photoelectrons are released from the cathode they accumulate near the cathode stopping other ...
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What happens to a metal after the photoelectric effect takes place?

I am curious about the photoelectric effect and can not explain myself a couple phenomena. When a photon hits an electron and thereby knocks it out of the atom into the 'void', what happens to the ...
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Can electrons come out due to photoelectric effect from any where else than the surface? [closed]

Can electrons come out due to photoelectric effect from any where else than the surface? Like what can the electrons only from the surface come out. For a scene, suppose a light beam of sufficiently ...
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Question about total energy of ejected electrons?

We know total energy of a body is the sum of total kinetic energy + potential energy. What I learned from atomic electromagnetic theory of light is that kinetic energy of ejected electrons = Hf - W(...
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Why does Einstein's photoelectric effect equation assume $\text{KE}_{max}=\frac{1}{2}mv_{max}^2$

The derivation of Einstein's photoelectric equation is shown as such in the textbook I am currently using: The work function $W$ of a metal is related to its threshold frequency $f_o$ by: $$W=hf_o$$ ...
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Instantaneous ejection of photoelectrons indicative of particle nature of light?

My physics textbook under a section explaining about How wave nature of light does not explain Photoelectric effect, mentions the following: No matter how small is the intensity, photoelectrons are ...
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Photoelectric Effect Graph: Interpretation of Intensity vs

After performing dimensional analysis of the current versus voltage graph when studying the photoelectric effect, this graph should measure units of siemens. It shows, however, high intensity and low ...
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if same power light, shorter wavelength light make more electron pop up?

assume both light have short enough wavelength to make photoelectric effect. then longer wavelength light have to have bigger amplitude to be same watt, and more number of photons. and this make more ...
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Why can't an electron absorb multiple photons? [duplicate]

I am quoting the following phrase from my book " ... in Einstein's picture, photoelectric effect arises from the absorption of a single quantum of radiation by a single electron ... " My ...
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1answer
58 views

Does amplitude modulation change a photon's frequency or the number of photons?

In the following, we assume that the polarization is aligned such that the scalar treatment of the electric field is justified. Furthermore, we limit the discussion to a fixed coordinate $x=0$ to drop ...
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Photoeffect with relativistic electrons

I know that general relationship between the frequency $f$ of the photon, the potential $U$ and thw work function $\phi$ is given by: $$eU=hf-\phi$$ I wondered if this relationship would be still true ...
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Electron leaving the atom

From the photoelectric effect, we know that a photon can kick an electron outside the atom if it has the right amount of energy ($E_{\gamma} \geq W_0$). On the other hand, pair production tells us ...
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Does work function of photoelectric effect follow conservation of energy?

If an electron receives the right photon, it gets excited and emits another photon or multiple less energetic photons when it returns to ground state. Therefore energy is conserved. However, if an ...
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Do metal alloys exist with work function of ~1.4eV?

I am wondering if metal alloys with a work function of between 1.1-1.7eV (ideally 1.4eV) exist? Some information exists on photoelectric work functions of metals here and here. Cesium seems to have ...
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Why my formulary says $KE=qV$?

So according to this formulary: Also: Therefore: Now, if we substitute: Then: What happened to the 1/2 in the right side?
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Approximating current in photoelectric effect

I am currently doing an experiment looking at the energy distribution of photoelectrons in the photoelectric effect. I have done some data collection for different wavelengths of light, and have the ...
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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 same emitting area in this experiment as shown in figure The distance of both the sources is adjusted to be the same (indicated as d) ...
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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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