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Questions tagged [photoelectric-effect]

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

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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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Cases wherein electrons do not follow “all or nothing” principle

The Wikipedia article on photoelectric effect has the following line: Electrons can absorb energy from photons when irradiated, but they usually follow an "all or nothing" principle. All of the ...
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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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Relationship Between Saturation Current and Light Intensity According to Wave Theory of Light

I'm having a bit of trouble reconciling information taught about the wave theory of light and the predictions it makes about the photoelectric effect. Let me first explain my understanding of the ...
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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 ...
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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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Photoelectric current vs anode potential

Attached is the graph of photoelectric current vs Anode potential as given in my book for same intensity and different frequencies of incident light for the same metal(hence same work function). In ...
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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 ...
33 views

Covariant relativistic photoelectric effect

General textbooks introduce the photoelectric effect as the Einstein's formula $$hf=hf_0+E_c(max)$$ and where $E_c=mv^2_e/2$ is the kinetic energy maximum value, the work function is $eV_0=hf_0$, and ...
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Is the direction of momentum important in photoelectric effect?

I was wondering that does the momentum (direction also) of emitted electron depend on absurbed photon or not? I couldn't find much explanation on internet about it. They show like the emission of ...
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What does it mean if the resistance of a semiconductor increases due to light?

I have synthesized an $n$-type semiconductor material $\text{ZnO}$. Under light illumination, its resistance keeps increasing. What are the reasons for this?
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Photoelectric effect photon attenuation disctontinuities

Can anyone explain why there are the discontinuities in proximity of the electron energies? I was thinking : every time the photon gains enough energy to ionize a new and a more bounded electron there ...
10k views

Can the photoelectric effect be explained without photons?

Lamb 1969 states, A misconception which most physicists acquire in their formative years is that the photoelectric effect requires the quantization of the electromagnetic field for its explanation. ...
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Classical wave energy vs Photon energy

The classical theory says that the intensity of light is proportional to the square of the amplitude of an oscillating electric field. Quantum theory gives the intensity of light as proportional to ...
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Consequences of changes in photoelectric experiment setup on stopping potential

If we increase the distance between the collector plate and the emitter plate in the setup of the photoelectric experiment, then will there be any change in the stopping potential? (this thought comes ...
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What increases the resistance at collector in photoelectric effect?

The photoelectric experiment uses a setup like this: The graph of photoelectric current $I$ against potential applied at the anode/collecting plate $V$ looks something like this: Once we reach the ...
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What kind of interaction phototelectric effect is?

All standard-elementary books which discuss modern physics quote the value of time of interaction for phototelectric effect to be less than $10^{-8}$ seconds. If the phenomenon takes about this time, ...
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Does quantum efficiency of solar cells vary with irradiance?

I want to know if a solar cell exposed to high irradiance (perhaps artificial light) of say 1500 w/m2 would suffer reduced QE. For the sake of the question lets assume the solar cell is in an ...
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Why no photoelectric effect for copper and iron?

The classic demonstration of the photoelectric effect is discharging a negatively charged electroscope by illuminating zinc or aluminium connected to the electroscope with 254 nm light from a mercury ...
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Photoelectric effect confusion

I just have a quick confusion, so photoelectric effect says that light or photon act as particles not waves, however the photon energy is given by $E=hf$, so shouldn't the photon be initially a wave ...
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Is photocell current equal zero at threshold frequency?

In photocell is there currant at threshold frequency $f=f_o$? I mean $I=0$ at $f=f_o$?
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What importance of battery “ voltage” between cathode and anode in photocell? [duplicate]

In photocell at threshold frequency $f=f_0$ and voltage $>0$ (between cathode - and anode +) Is current $=0$ at $f=f_0$ and $v>0$? When voltage $>0$ and $f=f_0$, Does photoelectron have KE ...
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Does photoelectric work function change with voltage?

Consider a typical photoelectric effect investigation setup like: Light of a minimum frequency (threshold frequency) must be shone on the cathode in order to eject electrons. The minimum frequency ...
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Is plant photosynthesis more efficient than solar panels?

Is photosynthesis more efficient than solar panels? If so, by how much?
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Photoelectric emission Law time lag of emission of electrons

In Einstein's photoelectric emission Laws it has been described that there is no time lag between the incident light and emission of electrons(as written in my book),however I would like to question ...
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In the photoelectric effect, the current increases as the intensity of the light increases. Is there an equation for this?

I've concluded the intensity of the light (which is proportional to $\frac{1}{r^2}$) is proportional to the change in flow of electrons per unit of time. Is there an explicit equation showing this ...
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Direction of emission of Photoelectrons [duplicate]

Where does the information about the direction of the emission of the Photoelectron come from? Does it get it from the incoming Photon? I have seen a picture on wikipedia-page of the photoelectric ...
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KE in photoelectric effect

I photoelectric effect when a single photon's energy is absorbed, why don't all get the same Max $KE$. Because for an electron, there can be no loss in heat or any friction and all. Why do most of the ...
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Photoelectric effect in space floating metal

I have read this question: Electrical neutrality in photoelectric effect Now the answer by HiddenBabel says: Metals are conductors. As electrons escape, new electrons easily flow from ground ...
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Electrical neutrality in photoelectric effect

In photo electric effect ,if electrons escape, shouldn't that leave the metal positively charged ??. How does it maintain its electrical neutrality ? And if it doesn't , shouldn't the work function ...
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Energy in photoelectric effect

When a monochromatic light hits a surface there are two possible scenarios. First energy of the light is greater or equal to work function and second energy of light is smaller than work function. In ...
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Why does decreasing the wavelength of light while maintaining intensity decrease current in photo electric effect [duplicate]

I understand a photon with a smaller wavelength is more energetic so for a given intensity, less photons are incident on the electrons and so less photo electrons reach the detector per second. ...
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Planck's constant calculated by photoelectric effect laboratory is off

I conducted an experiment today where I had to use a photocathode of unknown material (model: Daedalon Corporation Photoelectric Effect EP-05) and study the photoelectric (PE) effect to make a ...
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How do solar panels generate infinite electricity?

We know that solar cells generate electricity utilizing the energy of the photon, but how can they generate electricity forever? In a n-type terminal we have the bond of silicon and phosphorous so ...
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Free electrons, conduction electrons and the photoelectric effect

I had this statement in my physics textbook Photoelectric effect is seen only when electrons are bound, because free electrons cannot absorb the whole energy of the photon while conserving ...
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Variation Of Saturation Current in Photoelectric Effect [duplicate]

In the textbook I refer to,and various places online, it is given that saturation current is independent of the frequency of light used and only depends on the intensity . But, let intensity= I ,here,...
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Questions regarding a demonstration of photoelectric effect

I would like you to refer to this video for the question https://youtu.be/v-1zjdUTu0o I have a few questions regarding the demonstration 1) Can I use a zinc plate extracted from a heavy duty ...
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Will an electron move in a photoelectric effect apparatus if the electrodes have 0 potential difference?

So I was reviewing for my test but I was struck by this question and it has been bothering me ever since. What if I have 0 potential difference between the electrodes in a photoelectric effect ...
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photoelectric effect and Quantized energy state

I know that the energy state electron is quantized. for example if n1's energy is 1 and n2's energy is 3 electron only absorbs 2 energy. it never absorbs 1 or 2.5 energy. but i learned that if the ...
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What if potential difference is 0 in photoelectric effect. And what would happen as it goes negative

I'm confused as to why potential difference in itself is not sufficient to move electrons and there is a certain kinetic energy required to move the electron
I'd like to know if the excitation of chlorophyll by photons $$Chl+ h\nu \rightarrow Chl^*$$ is instantaneous. I imagine a photon arriving $0.5$ Angstroms away from the molecule, and then disappearing ...