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bio website marty-green.blogspot.com
location Canada
age
visits member for 3 years
seen 11 hours ago

Mar
21
comment When combining three spin $\frac{1}{2}$ particles what are the corresponding states?
I didn't read your question carefully when I posted my answer (thanks for the upvote) but now I notice you list five states, including one with m=0. I'm quite sure that's wrong...there's always going to be an odd half-spin left over with three electrons.
Mar
10
comment What is the Bremsstrahlung or dipole radiation mechanism involved in the emission of radiation by the rotating or moving charge?
Of course you're right...my bad.
Feb
8
comment Which electron gets which energy level?
We can count the total number of electrons in an atom; but we can't EXACTLY count how many are an "orbital", because the idea of discrete orbitals is only a good approximation that helps us do chemistry.There really is just one big wave function for all the electrons in the atom.The common explanation of the Pauli principle makes it look like we just put two electrons in each orbital, but the correct technical definition of the Pauli principle is that if we reverse any two "electrons" the 3n-dimensional wave function, we get the same wave function back again except with a negative sign.
Jan
4
comment Why does a wavefunction collapse when observation takes place?
I'd like to know what people consider to be an actual example of wave function collapse. I've looked for a "top ten" list of examples and I don't think there is one on the internet.
Sep
17
comment Waves produced by a mass of water on the calm sea surface
@Anna Oh come one now.
Sep
9
comment Are the air particles in today's wind on earth (more or less) the same as the air 2/3 billion years ago?
Excellent answer. Slightly off topic, I have read that on average, every other nitrogen atom in your body has been through the Haber process.
Aug
3
comment Zeta regularization and Renormalization group
Thanks, Jose. I think this is the first time I've been picked as the winning answer. I don't know what zeta regularization is but I like to create a chain of physical logic to justify the math. That's the only way I have confidence that the math is giving me the right answer.
Jun
17
comment Can the photoelectric effect be explained without photons?
Ben, it is hard to see how you can be absolutely sure that some of the energy for that ionization didn't come from the 1200-VDC power supply. You should read my article on Quantum Siphoning, linked elsewhere on this page by Helder Velez, where I explain how those kinds of processes can work. In my article I explain how it works for the case of the photographic plate, but I think the Geiger Counter is the same in principle.
Jun
17
comment Can the photoelectric effect be explained without photons?
The problem with all of your "conservation of energy" arguments is that they can never be verified experimentally. The device which measures the supposedly early electron is inevitably a tube with a 1200-volt power supply or something of that kind, which is clearly capable of supplying the energy necessary for the detection event. There is no reason to think the detection energy had to come from the "photon".
Jun
16
comment Can the photoelectric effect be explained without photons?
Ben, you're the one that introduced Compton and Black Body into the discussion, not me.So you shouldn't criticize me for going "off-topic". There's nothing in the original post about anti-correlation either. The question was about whether the "textbooks" have it wrong, meaning I would think the common undergrad textbooks with their "three nails" narrative. I think I answered the question.
Jun
16
comment Can the photoelectric effect be explained without photons?
Ben, the textbooks dispute precisely those aspects of these phenomena which can be explained by a good semi-classical approach. And I'm not talking about BKS...you obviously haven't had time in the 16 minutes since I posted to read the articles where I show how it's done.
Jun
6
comment Problem counting spin states
OK, I finally see what this means. If we can assume that all these states are equally probable, then this distribution sort of gives you the spherical density of spin states. So I put it into a spreadsheet to see what it looked like...in particular, if it would line up with the distribution of velocities in a gas a thermal equilibrium. It was kind of close, but not all that close. I wonder what it means...
Jun
4
comment Problem counting spin states
Thanks, Lagerbaer. I've had some more thoughts on this so I added them to my question as an edit. Hope you'll check it out.
Apr
5
comment What are the various physical mechanisms for energy transfer to the photon during blackbody emission?
I would think that in a metal, the conduction electrons would form more or less a stationary cloud, while the lattice vibrations would consist of the metal ions, accompanied by most if not all of their tightly bound electrons.
Apr
5
comment What are the various physical mechanisms for energy transfer to the photon during blackbody emission?
Yes, you are right, the lattice vibrations in a solid radiate just like an antenna. I think it's true that all of the thermal radiation properties of matter can be analyzed by finding the time-varying charge density (which is in principle calculable using quantum mechanics) and then just applying Maxwell's Equations to calculate the resulting radiation.
Mar
29
comment A charged sphere with pulsing radius
The other contributors so far have tried to give hints without giving away the answer, so I'm going to do the same. This problem is actually a physical description of a hydrogen atom in a superposition of the 1s and 2s states. There is a time-varying charge density in this superposition, and it is pretty much exactly what the problem here describes.
Feb
28
comment What was Albert Einstein's proof for $E=mc^2$?
Yes, Ron is probably out of his mind but he still knows more physics than ten anna vs and four dmckees put together.
Jan
31
comment How can I stand on the ground? EM or/and Pauli?
Ron, you shouldn't waste your time arguing with guys who use HAHAHA as a debating point. But back to the question at hand...I think I'm going to vote for Heisenberg as the root cause here. See my answer posted below.
Jan
31
comment How can I stand on the ground? EM or/and Pauli?
Actually, I think Ron Maimon is right.
Jan
18
comment How much effect does the Bernoulli effect have on lift?
@MikeDunlavey I stumbled across Denker's website about seven or eight years ago and it made a huge impression on me.