Questions tagged [photoelectric-effect]

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

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Does the interaction between 2 photons change its traveling directions?

As I understand from the Hong-Ou-Mandle effect, the interaction between 2 photons is possible. Can 2 Photons interact with each other in free space? Suppose that the 2 photons met in the spacetime ...
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Why is the wave nature of light not enough to explain the photoelectric effect? [closed]

Why can't we accept that waves transfer energy to the electron. Why say that it is the particle nature of light that interacts with electrons. My guess is that the particle explanation is more ...
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A question regarding waves and photoelectric effect

I was reading my physics textbook and there was an example in it in which an electromagnetic wave whose electric component varied with time as $$E=a(1+\cos\omega t)\cos\omega_0t$$ was incident on a ...
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How is the particle nature theory consistent with multi-photon photoelectric effect?

Under this question and answer discussion- https://physics.stackexchange.com/a/187562/297159 , how more than one photon can be absorbed by 1 electron has been explained briefly. However, if multi-...
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Tesla patented a device he believes gathered energy from light. (US 685,957 - Apparatus for the Utilization of Radiant Energy): [duplicate]

The invention is a sheet metal (top) place high above the ground. The sheet of metal is connected to a capacitor (the ⊔⊓ shapes) connected to the Earth. (The other stuff on the right of the image is a ...
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Is generating electricity from triboluminescence feasible?

I read an article about triboluminescence where sticky tape under a vacuum produces x-rays as it's peeled away. I was left wondering if the generated x-rays can be converted into electricity using ...
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Doubt on the predictions on the photoelectric effect according to the wave theory of classical physics

I read in some texts that classical physics predicted the following in the photoelectric effect, KE of electrons ejected is directly proportional to intensity of light Increasing the frequency would ...
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Is it possible for a metal plate to move when a beam of light rays is incident on it?

When a beam of light rays fall on a metal surface at an angle, shouldn't the electrons get ejected( due to transfer of energy and momentum ) just like in the case of photoelectric effect? Is it ...
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Does open-circuit voltage decrease when resistance increases in a solar cell?

In a solar cell, if resistance were to somehow increase (maybe heating up the panel), would that contribute in any meaningful way in decreasing the open-circuit voltage?
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What is the physical explanation behind the decrease of open circuit voltage as temperature increases in an amorphous solar PV cell?

I have researched and looked at several papers describing the effect of temperature on the $I_{sc}$ and $V_{OC}$, and seen many numerical explanations as to why the voltage drops, with reference to I-...
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Why does solar panel output vary across the day?

I have seen engineering projects where they build a solar panel to track the sun such as this one However, I don't understand their rationale fully. They argue that at one point in the day, the sun is ...
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Why is the mean free path length of an electron in a solid described by a “universal” curve?

I've been experimenting with XPS (X-ray photoelectron spectroscopy) and learned that the depth from which the observed electrons originated depends on their mean free path length, which makes sense to ...
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How to ionize oxygen molecule by UV rays without dissociating in to oxygen atom

Is it possible to ionize oxygen molecule(O2) without dissociating into nascent oxygen by high energy UV rays because oxygen molecule have ionization energy of 12.06eV and dissociation energy of 5.6eV. ...
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Why is momentum not quantised in the photoelectric effect?

I know that the momentum transfer mechanism in photoelectric effect is pretty complex etc, but why do we quantise the Energy of the photon but not the momentum ? Edit: had written conserved instead of ...
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Photosynthesis relation to work function and photoionization

When photosynthetic organism’s use pigments such as chlorophyll, the metal ion in the center emits an electron after absorbing a specific wavelength of light, at 400-700 nm This does not make sense to ...
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Problem in angle-resolved photoemission spectroscopy

In angle-resolved photoemission spectroscopy (ARPES), the energy $E_k$ and angle $\theta$ to the normal of a photoelectron is measured and used to find the band structure. The electron momentum ...
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Expected observation if one assumes that light is a wave instead of a particle in the photoelectric effect

For the purpose of this question I am pretending that I have not conducted a photoelectric effect experiment yet and I don't know what the outcome of the experiment will be. My questions are about the ...
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Does an electron emit light when it falls from a higher energy level to a lower one WITHIN A BAND?

If so, what determines the associated frequency? And if not, where does the energy go? Is the existence of energy bands instead of unique energy levels the reason behind metals being lustrous, since ...
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Experimental arrangement of photo current

In my book it say that between the cathode and anode there exist number of electrons which make the space charge. When light falls on cathode photoelectrons are released but is repelled by the space ...
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Variation of photoelectric current with frequency

I have heard that a minimum frequency (Threshold frequency) is required for photoelectric effect to take place, and photoelectric current is independent of frequency of incident light. That means ...
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Why do Photo diodes in Computer Mouses don't generate electricity when receiving light? [closed]

I had been researching about photovoltaic cells recently for a science project. In my researches,I stumbled upon photovoltaic cells,silicons,solar cells,and photodiodes. Photodiodes and Solar panels ...
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How the direction of radial vector in lattice space related to direction of momentum in real space?

In Photoelectric Effect, the density of states not only depend on the magnitude of the momentum but also on the direction of the momentum, we have to incorporate this in calculation. This is done by ...
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Do the experimentally obtained XPS Binding energies come from different shells? or all from the same shell ($1s$ $K$-shell)?

In experimentally obtained XPS atomic Binding Energy data like on NIST; is the ionization energy always for $1s$ electron, or it differs among elements? I checked the experimental data, and other ...
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Is Rubidium used in Photoelectric cell?

The question is pretty straightforward . I know that Potassium and Caesium are (famously) used for the purpose . Further Rubidium lies midway between Potassium and Caesium in s-block and hence a lot ...
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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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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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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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