Tagged Questions
11
votes
6answers
612 views
What are the various physical mechanisms for energy transfer to the photon during blackbody emission?
By conservation of energy, the solid is left in a lower energy state following emission of a photon. Clearly absorption and emission balance at thermal equilibrium, however, thermodynamic equilibrium ...
0
votes
1answer
58 views
Landauer's principle vs Wien's displacement law
Can we argue based on Landauer's principle that if one bit information is changed inside a blackbody, the total radiated energy should be at least or in order of kTln2? If it is so, can we also argue ...
0
votes
0answers
35 views
Landauer's principle vs Rayleigh–Jeans law
Can we argue based on Landauer's principle that if one bit information is changed inside a blackbody, the total radiated energy should be at least or in order of $kTln2$? If it is so, can we also ...
2
votes
2answers
244 views
Why does Planck's law for black body radiation have that bell-like shape?
I'm trying to understand Planck's law for the black body radiation, and it states that a black body at a certain temperature will have a maximum intensity for the emission at a certain wavelength, and ...
0
votes
2answers
194 views
What are thermal energy distributions?
I am trying to understand the photoelectric-effect deeply. My teacher used the Planck's law and integrated it to deduce the Stefan-Boltzmann law. He somehow showed some quantum-physical ...
1
vote
3answers
108 views
Why is the planck function continuous and not discrete?
If we imagine a object made up of Hydrogen gas that is optically thick to all radiation, and is in thermal equilibrium, then, microscopically, photons will be emitted and absorbed as ...
0
votes
1answer
2k views
How do you change Planck's law from frequency to wavelength?
I have to derive Wien's displacement law by using Planck's law. I've tried but I come to a unsolvable equation (well I can't solve it) anywhere I look online it comes to the same conclusion, you need ...
0
votes
1answer
164 views
Mathematical derivation of $N(\lambda)d\lambda$
We all know that in Rayleigh-Jeans law,
$$N(f)df ~=~ 8\pi f^2 df/c^3.$$
How do you derive $N(\lambda)d\lambda$?
I am sort of confused...
6
votes
2answers
471 views
Deriving Planck's radiation law from microscopic considerations?
In the usual derivation of Planck's radiation law, the energies or frequencies $\omega$ of the oscillators depend on the measurements $L$ of the black body. The model is such that the only ...
3
votes
1answer
570 views
How do we see different colours?
Why do different wave lengths cause electrons to behave(?) differently, causing us to see different colors?
What is happening at the quantum level which causes the colour black to absorb all of the ...
7
votes
3answers
891 views
Quantum mechanics of thermal radiation
What are the quantum mechanisms behind the emission and absorption of thermal radiation at and below room temperature? If the relevant quantum state transitions are molecular (stretching, flexing and ...
