Questions tagged [photoelectric-effect]

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

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Why doesn't the saturation photoelectric current depend on frequency?

From my understanding, even if the frequency of a photon is above the threshold frequency, it is not necessary that an electron gets ejected as the photon may have been absorbed by a metal atom ...
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Why is the probability of emitted electrons in photoelectric effect dependant upon the square of atomic number? [closed]

We know, p is proportional to Z²/Frequency in photoelectric effect. What is the purpose of the square term rather than using just the atomic number. Or is it just to satisfy the results obtained from ...
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Stopping potential and EM radiation

I'm a little confused about something We know from the photoelectric effect, that when a beam of light falls on the surface of a metal with very low ionization energy, electrons get ejected, one way ...
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If an atom has 'infinite energy levels', how does the photoelectric effect exist?

I don't quite get claims that an atom has 'infinite energy levels'. The photo-electric effect tells us that if photons of a certain threshold of energy are absorbed, the electrons will be freed from ...
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Photoelectrons travel with various KE

I learned that in the photoelectric effect experiment, an electron would possess maximum kinetic energy $KE_{max}=e{V_s}$, where $V_s$ is the stopping potential, that is equal to the photon energy it ...
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How did Einstein calculate the wavelength of photons?

Einstein's Photoelectric equation states that $$h\nu = h\nu_0 + \frac{1}{2}mv^2$$ which uses frequency. But if he assumed light to be a stream of particles how would he calculate it's frequency? de ...
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Phototcurrent illuminated gold plate

Let's say we have a gold plate connected to a current meter and illuminate the plate. How would you calculate the photo current? My first idea was to check the ionization energy of gold $E_{ion}$ and ...
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Recreating Millikan's Photoelectric Experiment

I am designing a set-up to recreate Millikan’s Photoelectric Experiment, which is similar to all the standard online simulations. I hope to achieve this without using a vacuum as it is very expensive ...
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Why electron do not eject out even when there is photon of less threshold energy with increasing in time [duplicate]

When photon having certain energy less than threshold energy strikes on the electron of metallic plate. Electron do not eject out. But my question is when photon are falling continuously then ...
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CCD potential well depth

For a while I've been curious about the design of charge coupled devices. All I can find about CCDs is more of a popular science junk that explains the operation principles but doesn't give any models ...
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Diffrence between thermionic emission and photoelectric emission

Thermionic emission involves heat energy to excite the electron and remove it. In the photoelectric effect, a beam of light is involved. As per my understanding heat and photons, both are energy. Heat ...
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Does photoelectric effect occur at stopping potential?

By applying stopping potential, does the photoelectric effect cease to occur or does the photoelectric effect occur and the electron does get emitted and with zero kinetic energy?
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How does the photoelectric effect coincide with thermionic emission and the particle nature of light?

I was watching a video explaining how the photoelectric effect shows the particle like nature of light. my understanding is that the frequency of the light determines the amount of energy delivered to ...
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Photon-Atom Interaction: Atomic Spectrum vs Photoelectric Effect

Apologize if the question is elementary or already asked (not aware of it). Far as I understand: Ground state electrons in atom can only absorb photons of certain (discrete set of) energies to jump ...
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How is the law of conservation of energy satisfied in a photoelectric cell?

In a battery-driven circuit, the current produced is of such a value that the power delivered by the battery (VI) is equal to the power dissipated in the resistance (I^2*R). If the resistance changes, ...
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Where does energy in a photo-emissive cell come from?

According to most textbooks, photo-electrons are attracted to a positively charged electrode (by connecting it to the positive terminal of a battery). If this is the case, then what is the practical ...
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What would happen if I were to shine light on a metal for a long time?

According to photoelectric effect, shining light of sufficient energy would ionized an electron from a metal. So what would happen if I were to shine a light on the metal for a very long time? Will ...
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Why is light with higher frequency more destructive, if it emits the same amount of electrons?

The Photoelectric effect states that if light with high enough frequency hits some matter, that matter will emit electrons. If you increase the intensity of light, more electrons will be emitted, but ...
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Basics of photoelectric effect

DISCLAIMER: I have not yet fully entered into the vast field of quantum mechanics and and was reading about the photoelectric effect as a part of chemistry, however I feel, the topic of structure of ...
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Photoelectric emission at frequency less then threshold frequency

If I shine an EM radiation of frequency $\nu$ on a metal surface which has threshold frequency of $\nu_o$, where $\nu < \nu_o$ then, will the emission occur by multi photon absorption? My reasoning ...
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Effect of Intensity on photocurrent

If, $I=\frac{nh\nu}{/at}$, why does photocurrent does not increase on increasing frequency? If same intensity and different frequency radiation is used, shouldn't $n_1\nu_1=n_2\nu_2$ hold true? [since ...
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Why photocurrent is different at 0 potential with varying frequency?

The problem Here in this graph when the potential is 0 photocurrent is different for different frequencies from what I understand frequency shouldn't affect the amount of photocurrent and yet it is ...
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What is the difference between photoelectric effect and photo-ionization?

Photoionization, ionization by a photon, and the photoelectric effect aren't they identical? If not then what is the phenomenological difference between them?
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Doubt on photoelectric effect

One failure of wave nature of light in photoelectric effect was that increasing the intensity of light did not increase the kinetic energy of electrons. I don't understand how this is true. We know ...
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Reducing the filament voltage has no effect on the maximum photon energy produced by characteristic or Bremsstrahlung radiation. TRUE - why?

I'm studying for my radiology exams and I don't understand the answer to this question. It states that the following sentence is true: Reducing the filament voltage has no effect on the maximum ...
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Does the Carnot efficiency apply to photoelectric conversion?

If you consider a black body as energy source and photoelectric conversion at room temperature as the energy receiver. Wouldn't it be possible to: use an ideal prism/diffraction grating to separate ...
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Does the Work Function have any effect on the Current of a Photoelectric Circuit?

I understand that varying the work function (while staying above the threshold energy) only effects the maximum kinetic energy of the photoelectrons, which in itself would not make a difference to the ...
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Why photocurrent doesnt increase after saturation limit in Photoelectric effect on increasing Voltage

As per what i learn that current(i) is rate at which charge flow through a cross section. Let assume we have 10 balls and it reaches another end while passing through some cross section, if 10 balls ...
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Does, and if so, why does the frequency of light and wavelength of light affect the photoelectric current?

It makes sense that intensity of light affects the photoelectric current, but what about the frequency and wavelength, given that intensity remains constant? The formula for intensity would be I = nhf/...
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How are photons arranged in a light ray?

Title, or more specifically, if a constant light source is directed onto a flat surface, would the photons spread equally on said surface? In addition, say, at the beginning, 10 photons reached the ...
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Relation of frequency of light and photocurrent in Photo-electric effect

As we know that the frequency of incident light is postulated to have no effect on the photocurrent. But coming to think about both quantities should be related. Consider the formula- ...
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What is the formula for photo electric current?

I am looking for formulas equivalent to Richardson's law and Child's law ( space charge limited emission). What I want to know is, how much current would I get for given material, voltage, frequency ...
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How does the spot size of light change the photocurrent?

I want to understand the photo electric effect. If I shine light at a surface then a photon can knock an electron off the surface if its energy $h\nu$ is larger than some minimum material specific ...
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Cannot a second photon strike the electron that has been excited by the first?

Suppose during the photoelectric effect experiment, an electron gets hit by a photon whose frequency is less the threshold frequency of the metallic surface. It will get excited, but we know that it ...
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Is there a material with work function less than 1 eV?

There are lots of problems related to photoelectric effect, which, for example, use, or have as answer, a work function of less than 1 eV. But when I search on Google, I found out that most metals ...
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How can a photon be partially absorbed an electron? [duplicate]

I am familiar that the there is a similar question , but elaborating my question " In the photoelectric effect the electron absorbs only a part of the photon 's energy which is needed for ...
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Why photoelectric effect proves particle nature?

If a giant water wave can change the altitude of a boat, then why can't electron's position be changed by waves. Afterall waves can make a ball rise and fall thus imparting energy to it.
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In a photoelectric cell, how come the electrons don't move to the higher potential through the vacuum without the need of an incident light?

I have been reading about the photoelectric effect and I have arrived at the photoelectric cell. Knowing that the air is removed from inside the cell, and assuming there's no incident light. How come ...
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How is depletion region of the negatively biased photodiode is re-filled with electrons?

We were taught that the photons' energy rips off the electrons away from their orbits in the atoms residing inside the depletion region of a negatively biased photodetector. My naive understanding is ...
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Radiation pressure and photon momentum

From classical electromagnetism we know that the electromagnetic field carries momentum, which is related to energy density of the field and in particular can be transferred to a particle via ...
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Why dosen't electrons loose energy in photoelectric experiments?

I was studying experiment on photoelectric effect. It was about effect of light intensity, frequency, potential etc. on photocurrent and KE of the ejected electrons (referring to the below setup). The ...
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Can you electrostatically charge materials with X-rays?

I am wondering if by making use of the photoelectric effect someone using for example X-rays radiation could electrostatically charge positively a dielectric like glass [1] and make it therefore ...
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Possibility of combining photovoltaics and solar thermal energy

In a private setting, photovoltaics and solar thermal energy are often harvested on the home's roof and roof area is limited. So, I thought about combining both, i.e. mounting solar collectors ...
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Some confusion about photoelectric effect [closed]

In photoelectric effect, we give negative voltage to stop the flow of electrons, but I don't understand what negative potential is and in which direction it is applied. Recently, I have performed the ...
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Photoelectric effect in hydrogen: evaluating the matrix element integral

I'm following page 503 of Shankar's Principle of Quantum Mechanics. The author is discussing the photoelectric effect and transition from the hydrogen ground state to a plane wave. Applying the ...
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How does moving an electron to a higher level actually work?

I understand the photoelectric effect and I assumed until an hour ago that to excite an electron, the photon should have energy equal to the binding energy of the initial level plus the binding energy ...
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Photoelectric effect and wave nature of light [duplicate]

We know that when a light of specific frequency is collided on the silicon metal plate electron released from it, this is the photoelectric effect This effect proves the particle nature of light , but ...
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Photoelectric effect for a positively charged plate in vacuum

In the link below, to demonstrate photoelectric effect, an electroscope is positively charged, then a UV light is shed on the top plate of the electroscope which causes the repelling force of the gold ...
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Is the threshold frequency for the photoelectric effect related to the mass of the electron?

I'm going to prefix this by saying that (a) physics is not my strong point and (b) I'm aware this is probably a coincidence. I learnt that the threshold frequency for the photoelectric effect is $\...
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The main charge carrier in the ionic crystal is polaron or conduction band electron?

Suppose I have a perfect crystal(e.g.TiO2-Rutile, band gap=3ev), under UV light, there should photoconductivity, according to the condensed matter theory, some of these excited conduction band ...
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