Questions tagged [photoelectric-effect]
The observed behavior in which light falling on certain metals can eject electrons from the surface.
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Assistance Needed to Identify PhD Advisor of Herbert Joseph Reich [closed]
I am currently working on creating an academic genealogy tree for physicists specializing in electric discharges. As part of this project, I am trying to identify the PhD advisor of Herbert Joseph ...
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Shot noise limited detection
can somebody please explain the significance of shot noise limit? I am trying to understand why and how shot noise degrades image quality, for e.g., while imaging weakly scattering specimens using an ...
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Does Voltage of solar cell depends on Intensity of light?
On measuring voltage across the two terminal of solar panel (made of semiconductor material) ,the Voltage (V) increases with increase in intensity (I) of sunlight in open circuit. But it should be ...
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Does photocurrent depend on intensity or on number of photons?
Edit: I have realised my mistake. The part of text I read assumed the light to be monochromatic and so in that case, there will be no difference between intensity and number of photons because the ...
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What happens after electrons get ejected in the photoelectric effect?
I’ve been trying to understand the photoelectric effect, and, as I understand it, when electromagnetic radiation (ER) of a suitable frequency, and therefore energy, hits an atom, its electrons are ...
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Photoelectron and electron in photoelectric effect [closed]
Could you please help me find some answers, as I have been stuck in this for a while and didn't get understandable answers.
what is the difference between the photo electron and an electron.
The ...
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Doubt regarding time lag during photoelectric effect
Recently,I was reading about the photoelectric effect and have a doubt regarding it:
Suppose I irradiate a metal surface with a monochromatic beam of light of frequency 'μ' such that μ > μ0 where ...
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Photoelectric effect - continuation of previous question (surface power density, diameter of photons, making converge 2 photons to same electron, etc)
This question is the continuation of a previous SE post of mine. Since I have $4$ questions to object to KDP answer, I decided to write this new post.
To sum things up briefly: we were concerned ...
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In the photoelectric effect, is the frequency in the work function by any mean a property for the absorptive atom in the cathode?
The work function is given by $E_{w}=h\nu_{c}$. Can we attribute the frequency $\nu_{c}$ to the absorptive atom itself? I mean, removing an electron from an atom result in forming a positive ion with ...
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Does the number of photoelectrons depend on the area of the beam for a given beam power?
I don't understand something in the photoelectric effect experiment (which consists in shining light to a metallic material and then measuring the kinetic energy of the ejected electrons, as well as ...
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Photo-excited Radiation/Electric Current with Green Function Method
Suppose there is an incident photo with a specific frequency hitting the material; the incident photo is absorbed by this material. Meanwhile, the material is excited by this incident photo and ...
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How do solar cells really work?
When I read articles on the workings of photovoltaics, the explanation tends to revolve around the idea of PN-junctions, and how an electric field separates charges (electrons and holes). In a Quora ...
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Why electrons do not emit electromagnetic radiation when they "jump" to an excited state?
According to electromagnetism, accelerating charges emit electromagnetic (EM) radiation. However, according to quantum mechanics, electrons do not emit EM radiation while they "orbit" around ...
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What is the relationship between frequency and photocurrent?
I know this question has been posted before but i'm down a rabbit hole as I keep finding different answers to it. My understanding is that photocurrent increases with intensity and decreases with ...
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Why does the stopping potential correspond to zero current?
My textbook has derived an equation for the stopping potential during the photoelectric experiment as follows:
$$\frac{1}{2}mv_\text{max}^2=eV_0 \\ \implies V_0=\frac{mv^2_\text{max}}{2e}\implies V_0=\...
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Why isn't the current in photoelectric effect graph always at saturation when the potential is greater than zero?
In the image above, even at a potential greater than zero, only after a certain point saturation current is increased. Even if a photoelectron is ejected with 0 kinetic energy, shouldn't even a minute ...
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Why isn't the positive-anode part of the graph for the photoelectric effect a straight line?
The graphs I've seen for the photocurrent vs. retarding potential have generally looked like this:
Source
I'm wondering why the photoelectric current doesn't immediately reach the saturation current, ...
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Seeking specific Scientific American form mid 1980s on semiclassical interpretation of Compton Scattering
I seem to recall seeing an article in Scientific American which discussed the possibility of interpreting Compton scattering in terms of classical electromagnetic wave theory. If anybody is familiar ...
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Why does photoelectric effect not affect the absorption spectrum?
What I know
Photoelectric effect
When the surface of a metal is irradiated with an electromagnetic radiation of frequency more than the threshold frequency of the metal, then the photon of the ...
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Density of States, Photoemission and Integrating the Number of States
I'm reading Fowler's theory on photoemission. I'm stuck on a part which Fowler helpfully identifies as "obvious". Fowler sets up the free electron model, suggesting that electrons need a ...
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Stopping Potential for the same wavelength is decreasing as I lower the intensity during my Planck’s constant calculation experiment
When I conducted the experiment of finding out the Planck’s constant using a photoelectric cell, I tried to verify that the intensity of light doesn’t affect the stopping potential. Doing this I ...
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If a liberated photoelectron has 0 kinetic energy, what will happen?
If a photoelectron was liberated from the material it was in, and all of the energy transferred to the electron from the photon was used to overcome the bonds in the material (where hf = work function)...
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Measuring AC voltage of the saturation photoelectric voltage
im working on an experiment on the photoelectric effect in which i try to calculate the saturation current of different wave-lengths.
i do so by calculating the photoelectric Voltage on a resistor and ...
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Excitation of Electron by Absorbing Photon [duplicate]
Let's assume that an electron requires 1eV energy to get excited to the 1st excited state and requires 1.7eV to the 2nd excited state.
What would happen if we supply it with 1.5eV?
Well, in my opinion,...
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The expression of photocurrent
Consider an electro-magnetic field represented in phasor notation $E_0e^{-jwt}$ incident upon a photodetector/photodiode, what is the expression of the generated photo-current $I(t)$? Here $E_0e^{-jwt}...
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Photolectric effect - ligth intensity and frequency
To my best knowledge the intensity of light determines the rate of electron emission and the frequency of light determines whether electrons will be ejected and their maximum kinetic energy.
If ...
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Calculating the proportion of incident energy transferred to kinetic energy in the photoelectric effect
Light of two wavelengths, $λ_1$ and $λ_2$, is incident on a metal surface of work function $ϕ$. If there is an equal number of photons of each wavelength incident per second, what is the maximum ...
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Photoelectric Effect combined with Doppler Redshift
Suppose we were standing in the vacuum with a photoelectric effect experiment. If we had a source of EM radiation emitting photons with a high enough frequency, we would begin to observe said effect ...
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Why increasing the voltage of the anode with respect to the cathode has no effect on the photocurrent?
As light strikes the emitting electrode, electrons are ejected. But not all of the ejected electrons are collected at collecting electrode since they don't all get ejected in the same direction. ...
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Accordingly to the classical theory, if the electrons' energies depend on the intensity, then on what does the electrons' number depend?
In the photoelectric effect, accordingly to the classical theory, if the electrons' energies depend on the intensity of the incident light, then on what does the electrons' number depend? I mean, how ...
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Can a CCD work in time integration regime?
Can one use a CCD in same way as photosensitive paper? When one has very low intensity like in single photons double slit experiment to see the interference pattern one puts a photosensitive paper at ...
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Why can each electron only absorb one photon in the photoelectric effect? [duplicate]
Studying the photoelectric effect for the first time, and can't find many answers as to why the ratio of electrons to photons absorbed has to be 1:1. Is it possible for an electron to absorb more than ...
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In a photoelectric current setup, what will be the impact on current if the frequency of each photon increased but the intensity remains same?
My textbook says that there will be no impact but that does not feel right to me.
The energy of each photon must increase so the no. of photons will decrease and the no. of ejected electrons will ...
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A confusion about a question on photoelectric effect [closed]
Q. Photoelectric effect supports quantum nature of light because
There is minimum frequency of light below which no photoelectrons are emitted.
Electric charge of photoelectrons is quantized.
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Photoelectric effect under the influence of gravitational time dilation
If the energy of a photon increases under the influence of time dilation in a gravitational field, does this have an effect on the photoelectric effect? Does this mean that the photoelectric effect in ...
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Why does there need to be a particle representation of light?
Why does there need to be a particle representation of light? Doesn't light as a wave explained the observations of the photoelectric perfectly? When the frequency of light is increased, the speed of ...
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Will a metal rod kept under very bright light for a huge amount of time, be able to conduct electricity?
I was just sitting when it came to me - will a metal rod that has been kept under bright light for a very long time, be able to conduct electricity?
I was thinking that because of photoelectric effect,...
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Special relativity and the Photoelectric effect
I set up a usual photoelectric experiment in a laboratory that is movable. Let's say, when stationary, the metal I am working with has a large work function and the light I am shining cannot produce ...
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Is the current of a SPAD a digital signal? (Question about Avalanche process)
I understand that when a Single Photon Avalanche Diode (SPAD) is biased and a photon hits it, an avalanche process is activated that cause a current. What happens if two photons hit it? Will the ...
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Finding the voltage at which saturation current is achieved
In the photoelectric effect, while studying saturation current, I saw that in most graphs with voltage, this saturation current is achieved relatively early at a certain "threshold" voltage ...
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How does photoelectron yield quantum efficiency change for metals in presence of electric field?
Figure 1 of this paper gives quantum efficiency for stainless steel. https://arxiv.org/pdf/1503.08074.pdf
However, I am interested in photoelectron yield quantum efficiency for stainless steel at 4kV/...
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Photoeletric Effect with Flames
Can flames (fire) induce photoeletric effect? I mean, as I know, fire is electrons changing orbital levels, which implies a $\Delta E=hf$ that is a photon being ejected. As it reaches the metal, and ...
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A confusion about the compton effect
I am really confused about the part where the photon shares a part of its energy with the electron. It is said that the photon loses some of its energy to the electron causing the change in its ...
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Momentum conservation in photoelectric effect
In analyzing Compton scattering we consider the conservation of both energy and momentum.
However, in analyzing the photoelectric effect only the conservation of energy is taken into account.
In fact, ...
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Anomaly in Photoelectric effect
Good day.
While doing a physics experiment for a university assignment, I was tasked with measuring the maximum wavelength at which a potassium cathode shined by a monochromatic light emits electrons.
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Is there momentum conservation in photoelectric emission? [closed]
There is actually a question in my textbook which I am unable to understand.I didn't understand anything
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How does the current flow in the Hertz expermiment when reverse voltage is applied and the polarity of the electrodes is reversed?
In the Hertz experiment, when light falls on the anode, electrons are emitted and they move towards the cathode and thus flow through the circuit.
However, when reverse voltage is applied and the ...
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Why do electrons in the photoelectric effect move towards the direction of where the photons came? [duplicate]
Why do electrons in the photoelectric effect move towards the direction of where the photons came? Intuitively I would have said that the electrons would go in the same direction the photons go. But ...
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How to find the standard atomic orbital energy data?
I found a website that provides the $d$ orbital energy of atoms. The data were found using Photoelectron Spectroscopy, which measures the energy needed to ionize electrons from atoms in the gas phase.
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Photocurrent in Photoelectric effect and its misconceptions
This question has been asked many times on this site before with different doubts in each question but I am conflicted with the vast amount of sources stating contradictory things.
There are many ...
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