Tagged Questions
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0answers
26 views
Contact electricity and photoelectric effect
Most universities provide an experiment about the photoelectric effect to determine $h$ by measuring the stop voltage against the light frequency and calculating the slope $h/e$.
But mostly they also ...
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1answer
50 views
Finding the maximum kinetic energy of any photoelectrons?
An incident photon, $f=5.5\times 10^{14}\ Hz$, hits a metal with a work function of $2.8\ eV$.
Find the maximum kinetic energy of any photo-electrons (in Joules).
I'm confused exactly how to do ...
1
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1answer
31 views
Color of a Metal's Threshold Wavelength?
How do I find the color of the threshold wavelength if the metal has a threshold wavelength of $\mathrm{6.5\times 10^{-7}m}$? I know that converts down to $\mathrm{650\ nm}$, but can I still use the ...
1
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1answer
26 views
Color of an incident photon?
If the incident light at 360nm causes photoemission of electrons, wouldn't the color be ultraviolet? I know that really isn't a color, but that's what my chart of the light spectrum says.
Unless I ...
1
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1answer
102 views
Specific electron energy gap values $E_{i+1}-E_i$ vs. photons with arbitrary energy $\hbar \omega$
The energy levels of electrons in an atom are quantized $E_i$. A photon of a specific momentum $\vec p$ and energy $$\omega=(E_{i+1}-E_i)/\hbar$$ hits an atom and gets absorbed. Okay now say the ...
2
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1answer
68 views
Ejected Electrons with 0 KE?
So I was taught that:
Kinetic Energy (of electron) = Energy (of photon) - Ionization Energy
If E(photon) = IE, then KE=0 of the electron.
What does this physically/theoretically mean?
My current ...
1
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5answers
144 views
Photoelectric effect without light rays
For electromagnetic waves we have the photon association, one imagines light as particles "flying around".
What is the analogy for a constant electrical field, one which doesn't change in time ...
0
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0answers
100 views
Cross section of photoelectric absorption vs Thomson scattering cross section
I am interested in more less the same issue as asked here but my question is:
Why for the low X-rays the photoelectric absorption is dominant over Thomson/Compton scattering? I am considering the ...
3
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3answers
1k views
Compton scattering vs. photoelectric effect
Say a photon hits some atom.
What determines whether there will be a photoelectric effect (photon is absorbed, electron is released) or whether there will be a Compton scattering (the photon is ...
1
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2answers
324 views
Is energy exchange quantized?
In the photoelectric effect there is a threshold frequency that must be exceeded, to observe any electron emission, I have two questions about this.
I) Lower than threshold:
What happen with lesser ...
