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Showing content with the highest reputation on 06/07/21 in all areas

  1. In Millikan's oil drop experiment, when the oil droplets fell through the hole in the top plate, and passed through the ionised air, did only electrons get attached to the droplets? Or both the electrons and the cations? In my book, only electrons are shown as attached to the droplet. Why only electrons got stuck? Why not the positive ions as well? Or did they?
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  2. It's a good question. I suspect it is to do with speed of motion. The electrons ejected from the oxygen and nitrogen molecules are light and move fast compared to the molecular cations left behind, so they will tend to encounter the oil droplets more quickly and more often, I imagine.
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  3. If I tickle you, can you keep from laughing ? if you stick your finger down your throat, can you keep from throwing up ? Can you stop a sneeze, or touch a hot object and not recoil your hand ? Do you automatically yawn when you see someone else yawn? You are more 'hardwired' than you think.
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  4. "Should academic research establishments be political?" That's like asking "Should we support a crusade?" and not asking why...
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  5. I think this is quite tricky, at least for somebody as rusty as I am. 🙂 If it were not for the H bonding, I think one would expect the ortho- substituted nitro group to increase the acidity the most, being closer. The H bonding will, I should have thought, tend to weaken the acidity, by providing additional binding of the H atom. In orthonitrophenol the H bond setup is close to ideal, as it forms a 6 membered ring, so it can be a strong H-bond. So that could explain why the acidity is anomalously lower than the para version. In orthobenzoic acid however, you have 7 atoms
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  6. To give a less mathematical response, it is the latter. For a QM entity to be in an exact place with an exact momentum is just not something that is even defined, in QM. The uncertainty is intrinsic to nature. From reading Carlo Rovelli's "Helgoland", it seems the "relational interpretation" of QM in effect denies that a QM entity even has any properties on a continuous basis. According to this view, all properties become manifest only in the course of interactions involving the QM system in question. In between interactions, it is not necessary to assume that it has any properties a
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  7. It applies to any pair of conjugate variables, so in QM it includes energy & time, and angular momentum & angular position as well. These variables don’t commute, so the order you do the operation matters. It’s inherent in QM i.e. it’s in the math. These variables are fourier transforms of each other. The observer effect is a distinct phenomenon edit: more detail here - https://www.forbes.com/sites/startswithabang/2017/08/12/ask-ethan-where-does-quantum-uncertainty-come-from/?sh=60c0a134794e
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  8. Right, that's why I propose the hyper sphere geometry. Our universe (the part we can perceive) would be the surface of the hyper sphere and the mass of dark matter would be located in the center of the hypersphere. Each body of matter in our universe would be equally distant from the center of the hyper sphere. A hand-wave is sadly the farthest I can go 😅
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  9. Dear Swansont, yesterday I just stumbled on the Scienceforums.net while doing some research. Honestly, I just discovered it. I was really amused by, actually, your comments and I had the impression that you had good understanding of physics. This is the reason why I posted my paper here. Elegance and symmetry are underlying principles of mathematics, group theory, ... Let me cite Paul Adrian Dirac: "What makes the theory of relativity so acceptable to physicists in spite of its going against the principle of simplicity is its great mathematical beauty. This is a quality which cannot be defined
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