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| bio | website | marty-green.blogspot.com |
|---|---|---|
| location | Canada | |
| age | ||
| visits | member for | 2 years, 1 month |
| seen | May 17 at 18:53 | |
| stats | profile views | 338 |
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Apr 5 |
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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. |
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Apr 5 |
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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. |
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Mar 29 |
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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. |
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Feb 28 |
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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. |
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Jan 31 |
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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. |
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Jan 31 |
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How can I stand on the ground? EM or/and Pauli? Actually, I think Ron Maimon is right. |
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Jan 18 |
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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. |
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Jan 18 |
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How much effect does the Bernoulli effect have on lift? @mike Thanks Mike. I'm not used to people agreeing with me. |
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Jan 18 |
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How much effect does the Bernoulli effect have on lift? It is equally true that all the lift depends on the change in airflow direction. You have to calculate one or the other but not both. |
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Jan 18 |
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Can light be canceled by merging with an inverted wave? @EduardoGuerras Acutally I did downvote and then regretted it. I think it's more important to leave the upvotes as evidence of the quality of voting that goes on here. |
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Jan 18 |
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Can light be canceled by merging with an inverted wave? Eduardo you are so right. |
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Jan 16 |
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Radiated power and energy density for a black-body I may have been hasty in my explanation when I said you get a "factor of 2" on the average speed of energy perpendicular to the surface. I've redone my calculations carefully and I seem to be getting an overall energy density of (3*pi/2)(power/c). I'll try to post the analysis as an edit to my answer. |
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Jan 15 |
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Radiated power and energy density for a black-body you beat me to it by 5 minutes. |
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Jan 8 |
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Is there any thing other than time that “triggers” a radioactive atom to decay? Thanks, Helder. It's too bad that this website doesn't promote more discussion. I feel like after the first day or two, the topics just disappear from the radar. |
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Dec 31 |
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How does scattering work? I find it disturbing that people are upvoting this answer. Surely the scattering of sunlight by molecules in the air has nothing to do with coulomb potentials. And there is no attempt to address the question of why the sky is blue. |
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Dec 16 |
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Tidal force on far side Yes, the electrostatic case is the same as gravity. The immobility condition however is problematic. An important aspect of the tidal system is that the earth and moon are in free-fall about each other. That's why the average field has no visible effect, and only the distortional component is at work. Also, I question Nick's asymmetry. In my analysis, the quadrupole force is symmetric. |
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Dec 13 |
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Angular Momentum of Diatomic Molecules Yes, that's the same bond length I'm using; I've expressed it as 2.2 Bohr radii, using a value of 53 picometers. |
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Dec 6 |
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Does a wing in a potential flow have lift? Mike, you have posted the link to the only website anyone should ever consult when it comes to airfoils and lift. Well done. It's amazing that you got downvoted. I will refrain from upvoting your answer because I want the record to show the quality of voting that goes on here. |
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Nov 7 |
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Wave/particle duality I really posted my link because it specifically addressed your point about the photographic film. I wonder why it is necessary for you to bring up the photoelectric effect to counter my reasoning? My article deals with the photographic plate, not the photoelectric effect. |
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Nov 7 |
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Wave/particle duality I'm going to challenge the suggestionn that absorption of light works by the interaction of single photons with single molecules. In my blog article on Quantum Siphoning, I show how you can understand the process as the interaction of a classical e-m wave with an ensemble of atoms in the photosensitive crystal. You can read the article here: marty-green.blogspot.ca/2010/03/quantum-siphoning.html |
