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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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Is the uncertainty principle a circular argument? [on hold]

Uncertainty is due to the measurement techniques humans tend to use requiring photoelectric effect. The Planck constant is due to the photoelectric effect. If the standard deviation of measurement was ...
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Photoelectric Effect and stopping potential [on hold]

Explain the following:The stopping potential $V_0$ varies linearly with the frequency $\nu$ of incident radiation for a given photosensitive surface with the slope remaining the same for different ...
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Question about IV graphs of the photoelectric effect [on hold]

I've seen a couple of different IV graphs comparing higher vs lower frequency light. Both graphs will have the higher frequency $V_0$ more negative than the lower frequency, however the two graphs do ...
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Probability of Photoelectric and Campton decrease as photon energy increases, WHY? [on hold]

Why Probability of Photoelectric and Campton decrease as photon energy increases??
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Fermi Energy For platinum

I have been conducting an experiment based on the photoelectric effect and have calculated my work function as 1.15eV which is afar lower than what we expect for platinum. Then i found out that the ...
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Relativistic photoelectric effect

Suppose, one conducted an experiment with a monochromatic light shining on a metal plate with a certain work function. It turns out the electron is ejected. When this experiment is observed by another ...
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Why are solar cells affected by temperature?

I know that solar cells efficiency increase with lower temperatures, but why? I found only equations on efficiency using temperature coefficient, but I want to know the physics behind it. Thank for ...
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photoelectric equation explanation [closed]

how to determine whether or not relativistic mechanics is needed to verify the photoelectric equation with a 1% uncertainty. While the stopping potentials are few volts.
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Hallwachs' Experiment: why zinc?

The famous experiment by Hallwachs that eventually lead to Einstein's photon hypothesis was conducted using a negatively charged zinc plate. I always thought that the effect was initially observed ...
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Photoelectric effect and the type of the incident light

Given the relation between the voltage V and the photocurrent I . Does this graph hold for both monochromatic light and white light? And why there is a value for the photocurrent I at V=0 ?
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Threshold energy for photoelectric effect

I'm trying to derive the threshold energy for the photon in photoelectric effect, but I'm not sure how to treat the electron. What can I assume about the final kinetic energy of the electron? I want ...
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2answers
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Does the work function of a metal change with respect to the wavelength of emitted photoelectrons?

I am taking an introduction course to quantum mechanics, in a homework question we are asked to calculate Planck's constant given the maximum energy and wavelengths of two types of photoelectron ...
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How to demonstrate the Photoelectric effect?

I’m looking for a simple experiment to present (as an extra) to my class regarding the photoelectric effect but I don’t have many materials. From my understanding when UV light is incident on a ...
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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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Probability of Photoelectric Interactions

I have am currently reading Radiation Detection and Measurement, by Gleen F.Knoll, and in chapter 2 page 49, he talks about the probability of the photoelectric interaction as: $$\tau \approx C \frac{...
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What is the term for the light-sensitive metals in the photoelectric effect?

Can anyone please tell me the term used to refer to metals such as those used in photoelectric effect which can generate a current from light?
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Drift velocity and current at different cross sections in the tube during photoelectric effect

In photoelectric effect if we look at two different cross sections inside the tube at saturation current. Then the average drift velocity will be different as the electrons are accelerated by external ...
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1answer
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Can electron leave an atom due to electric field?

I know about photoelectric field, but it's about an E&M waves (photons). How about external electric\Coulombic\static field (virtual photons)? Can it turn the electron away from atom? I wonder, ...
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Why the free electrons in space can not be excited by photons? [duplicate]

Any electron (in the shell) at any orbit of around of an atom can be stimulated by photon (of course as depending on the energy level of photon). So that, it can change its orbit and come back ...
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In photoelectric effect, what is effect of frequency? [closed]

So what does the frequency of the light in photoelectric effect does ? Does it increases number of electrons?
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Under ideal circumstances, is it possible to construct a 100% efficient photoelectric circuit?

Lets assume some ideal circumstances: 1) The incident light has same frequency, greater than the threshold frequency (sufficient to eject inner electrons too), throughout. 2) The work function ...
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Photoelectric effect with electrons

Consider a beam of electrons (each electron with energy E0) incident on a metal surface kept in an evacuated chamber. Then,. (a) no electrons will be emitted as only photons can emit electrons. (b) ...
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Energy quantization at differenet frequencies

An electron emits light of v1 frequency. When we say energy is quantized in this case, the minimum packet of energy would be hv1 but electron can emit 2hv1, 3hv1 and so on energy. is that correct.? ...
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Why does classical physics imply every mode of vibration should have the same thermal energy?

I've just started reading about photo electric effect here, and my high school level understanding goes something like this : 1) By 1900 we had Maxwell equations and treated light as a wave. 2) But ...
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1answer
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Is the phase of the photon which photoemits the electron anyhow reflected in the photoelectron wafeunction?

Imagine you have a carrier-envelope stable optical pulse. You use it for photoemission of an electron wave-packet. This electron wave-packet can be considered as a superposition of plane waves, with ...
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In the photoelectric effect experiment of stopping voltage, why isn't there a buildup of negative and positive charge on each side of the circuit?

Given this schematic, and that there is an electric field in the downwards direction due to the power supply, when the photon hits the emitter plate, the electrons leave the upper plate and hit the ...
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What produces higher frequency light?

I don't know much more than the basics of the theory, so if my question stops making sense at some point, an answer addressing that would be awesome. From what I understand so far, photon creation ...
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2answers
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Shouldn't the frequency increase the current in the photoelectric effect [duplicate]

I know that intensity determines the no. of electrons and the current produced. But if the intensity is constant and the frequency changes, the kinetic energy of the photoelectrons changes, so their ...
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Shouldn't intensity increase the stopping voltage in the photoelectric effect?

More intensity means more number of electrons so more probability of there being energetic electrons reaching the collecting plate so the stopping potential should technically be more. But all the ...
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the effect of electric potential on the threshold frequency in the Lenard's photoelectric experiment

I have been taught that electrons can ejected from the atom by applying strong electric field(field emission), and according to photoelectric effect even light of certain frequency for certain atom ...
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Dark current and thermal excitation in CCDs

In charge-coupled devices (CCDs), doped semiconductors are used to produce an electronic signal from incoming photons - the underlying principle being the photoelectric effect. This simple law tells ...
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How does Einstein's oscillatory & quantum structure of radiation from 1909 relate to modern physics

In his 1909 lecture The Development of Our Views on the Composition and Essence of Radiation Einstein discusses two structures of "radiation": As far as I know, no mathematical theory has been ...
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Why are photo electrons emitted instantly from metal surface just nanoseconds after the light falls upon it?

Why are photo electrons emitted instantly from metal surface just nanoseconds after the light falls upon it? How does the quantum theory of radiation explain it? Why can't classical physics explain ...
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When a photon hits a moving atom and stops it, why do we take momentum of photon rather than energy to calculate the change in motion of atom? [closed]

In the case when hen a photon hits a moving atom and stops it, if we consider that while equating energy, we ignore transmission of energy into other forms, and thus, momentum conservation is better ...
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Can photoelectric effect be used to charge a plate enough to generate electricity

I was wondering if the photoelectric effect can be used to positively charge a metal plate, as electrons are emitted from the surface. One end of the circuit load can be connected to the the metal ...
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Why did this error occur in the photoelectric experiment?

I was experimenting with the photoelectric effect to see the effect of frequency of incident light with the current. Theoretically, the saturation current should be the same irrespective of the ...
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1answer
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Why does MPI require high intensities?

I have been reading up on multi-photon ionization recently, and I can't seem to find an explanation for this. My understanding so far is that if you need x amount of energy to excite an electron, and ...
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1answer
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heated metal electrons (not) ejected (yes for photoelectric effect)

I understand that in the case of photoelectricity, electrons can be ejected off the metal. In this case light shines on the metal giving energy to the metal. But in the case of a heated metal (not by ...
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3answers
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Is it possible to power a car with chemiluminescence? [closed]

Chemiluminescence means substances that in a reaction emit light. I wonder if such a reaction would be possible to power an electric car using an photovoltaic panel lighted by the chemical reaction?
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Is photoelectric effect example of inelastic collision

I was reading photoelectric effect , which was completely explained by Einstein. And a bit difficult question , atleast seems to me is whether photoelectric effect is inelastic collision or elastic ...
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Why is not a solar plate ionised?

When sunlight is allowed to incident on a solar cell, photons are absorbed and electron hole pair are produced in P and N regions. The electrons and the holes generated over a small distance from the ...
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What is the physical formula relating the current to voltage for the photoelectric effect?

The I-V characteristic for a transistor is well known. I would like to know if there is a formula connecting the current to the voltage in the photoelectric effect?
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Relationship between intensity and electron emission from a metal?

Here's the question: A xenon arc lamp is covered with an interference filter that only transmits light of 400- nm wavelength. When the transmitted light strikes a metal surface, a stream of electrons ...
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1answer
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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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1answer
132 views

Effect Of Frequency on Photocurrent

The situation is this.. I am performing a photoelectric effect experiment - just the usual - evacuated glass tube containing two metal electrodes connected to an external source of DC voltage (say an ...
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Measuring time in the photoelectric effect

Consider the following hypothetical: An atom is traveling with a velocity of v to the left, directly towards an incoming photon, as crudely depicted below. p----> <----A Question (1): What is ...
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Question about photoelectric effect

Let's say we have a metallic plate and a light source so that each atom of the metal will receive $15'6\space \frac{meV}{s}$ (mili electron volts per second). Assuming the work function of the metal ...
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1answer
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If I rotate a metallic plate with a threshold frequency of f0 around a light source with a frequency of f0, would the plate eject electrons?

The concept is to construct an analog of the Kundig experiment, but for the photoelectric effect: Kundig Experiment
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principle about SPAD for ToF ranging module from ST

My colleagues are using VL53L0 from ST which is one ToF ranging module. I am trying to understand the principle about the SPAD(single-photon avalanche diode) and have read many materials on it. From ...
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1answer
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How does the photoelectric current vary with increase in amplitude of the incident photon?

In Photoelectrc effect, increasing the amplitude of the incident light increases the amplitude of a single energy packet. So, increasing the amplitude will not increase the number of photons. But ...