Could a natural nuclear fission detonation ever occur? |
- Could a natural nuclear fission detonation ever occur?
- Why do rocket ships appear snowy on take off?
- Why don't we just eat calorie bombs that have the reccommended daily intake instead of spending money on low carb, expensive foods?
- How do muons differ from electrons in cosmic radiation?
- How do physicists define (or characterize) true randomness?
- Can a Hall effect detector detect currents in nerves accurately or at all?
- What is the chemical reaction occurring with fiber-reactive tie-dye?
- How is quantum entanglement achieved in real world practice?
- What is the fundamentals of calculus?
- [physics] How does gravity differ across a planet?
- What's the gravitational field of a "particle in a box"?
- How much energy does an electron/beam of electrons have to have before it becomes dangerous to human health?
- Could you slow down radioactive decay by speeding a radioactive isotope to relativistic speeds (99.9999999% the speed of light)? Just a thought experiment. Kinda Like the twin paradox but with 2 decaying isotopes.
- Why is cyanide an anion, but carbocations cations?
- Why can't we collapse a photon to its position eigenstate, stopping it all together?
- Can we talk about Photoelectric effect if the Electrons are not ejected, but only excited to a higher energy level?
| Could a natural nuclear fission detonation ever occur? Posted: 19 Mar 2017 06:45 AM PDT |
| Why do rocket ships appear snowy on take off? Posted: 19 Mar 2017 05:38 AM PDT Hey so I'm watching CNNs "The Sixties" this morning, and I just watched the one about the space race and Apollo missions and so forth. Great documentary series by the way if anyone needs something to watch. But, I've noticed that, on lift off, the rocket boosters and large cylinders beneath the shuttles or capsules or whatever, have sheets of what appears to be ice/snow falling off them. Is this the result of storage? A thermo dynamic phenomenon? Is this even snow/ice? Thanks! [link] [comments]  |
| Posted: 18 Mar 2017 02:09 PM PDT |
| How do muons differ from electrons in cosmic radiation? Posted: 19 Mar 2017 02:36 AM PDT Could someone explain how electrons behave when hitting the earth vs how muons behave? I know that they have a gigantic mass compared to electrons, but what does this change? Do they fly further, are they "brighter", do they cause any "reactions" that electrons don't ? [link] [comments]  |
| How do physicists define (or characterize) true randomness? Posted: 19 Mar 2017 01:59 AM PDT I've been wrestling with the idea of randomness a seemingly deterministic universe, and I've realized that I'm not entirely sure how to rigorously define what randomness is. To be clear, I'm talking about true, ontological randomness, not the weaker epistemological version ("for all we can ever know, it may as well be random"). Many definitions I've read seem to conflate two subtly different ideas: 1) An event is random iff it was not initiated by a cause; that is, iff it is not an effect of another event (visualize a billiard ball "randomly" shooting forward on its own). I've heard quantum mechanics described as "acausal," which seemed to be used interchangably with the idea of randomness. 2) An event is random iff its outcome is probabilistic at best, and not deterministic; that is, iff its result cannot, even in theory, be perfectly accurately predicted given all possible information and computing power (visualize a billiard ball being struck by another, and being jolted into a "random" trajectory such that, even flawlessly recreating the initial conditions, it could have taken a different path). A possible third one seems a little over-restrictive to me, but I'll include it for completeness, because it seems to be common: 3) An event is random iff all outcomes are equally likely. It seems to me that this definition is a more restrictive version of (2), leaving out non-uniform probability distributions. I'm also not sure that 1 and 2 are not logically equivalent. (Might a probabilistic outcome require an uninitiated event to have occurred at some point in its causal chain? And conversely, wouldn't an uninitiated event be inherently uncertain?) Or, if not quite equivalent, how might they be related? Note: I realize it isn't universally agreed on that true randomness exists at all. It's a super interesting topic which I see discussed a lot here—which is what's prompting me to ask what, precisely, it is. [link] [comments]  |
| Can a Hall effect detector detect currents in nerves accurately or at all? Posted: 19 Mar 2017 01:59 AM PDT |
| What is the chemical reaction occurring with fiber-reactive tie-dye? Posted: 18 Mar 2017 01:57 PM PDT Looking for something like a simple chemical reaction equation, but I would love to get information about kinetics of the reaction, the type of reaction occurring (substitution, elimination, etc.), or any details that I can to get a thorough picture of the chemistry. For an example dye, I'm talking about something like these Fiber reactive dyes that work really well at dying clothing that has been soaked in an alkaline solution for some time. To my knowledge, the alkaline solution (usually soda carbonate, pH roughly 11.5) deprotonates the cellulose fibers in the cotton clothing to some degree, which then gives the dye a spot to chemically bond. I don't understand the mechanism of how this happens though or anything more specifically. Motivation: I've been running a tie-dye workshop for K-12 students for some time now, which is fun and gives me the opportunity to talk about some basic chemistry concepts (solutions, pH, bonding) but I would like to buff it up a bit with some more advanced concepts for the benefit of college students and/or more curious students. Any help goes to teaching people more about chemistry, much appreciated! [link] [comments]  |
| How is quantum entanglement achieved in real world practice? Posted: 18 Mar 2017 11:38 AM PDT From what i think know, you take two particles at one location, magically entangle them(this magic is the core of my question), then separate the particles and measure. Is it a synchronization of say their magnetic fields or some other energy that makes them deterministic after being separated? [link] [comments]  |
| What is the fundamentals of calculus? Posted: 18 Mar 2017 08:14 AM PDT So guys, I'm in my last year of highschool, around 36 days to my final examination. I have no problem with normal maths, but then there is additonal mathematics... One topic I can't seem to UNDERSTAND is calculus. Don't get me wrong, I KNOW it, but I don't understand it. Like I know intergration is the oppostie of differentiation. But what is calculus exactly? I know that you can use it to find area under graph, speed, distance and acceleration of a body. But honestly who writes speed and distance in terms of x & y in real life? I don't know if I'm making myself clear, but I want to understand the topic. It's like why does this topic exist. I am 100% ignorant in this topic. I don't want to be someone who memorizes all the formulas without having a clear understanding of them. So, how is calculus used? Or rather what is it? Sorry for the long wall of text, I've just been frustrated for a while now, I can't let this topic beat me, can I? Hehe [link] [comments]  |
| [physics] How does gravity differ across a planet? Posted: 18 Mar 2017 05:23 PM PDT There is a post in /r/space about a gravity map of the moon. It varies. How does this occur? My limited understanding is that gravity is determined by mass, the more mass the greater the gravity. This is also affected by the density of the mass, with both mass and density playing together to make gravity. So is the variation in gravity across the moon (or another planet) due to pockets of more dense elements? Is it just averaged out? How does the fluctuation in gravity across the earth affect the orbit of say, the It's? [link] [comments]  |
| What's the gravitational field of a "particle in a box"? Posted: 18 Mar 2017 12:31 PM PDT Looking at the electron cloud of a hydrogen atom or other such "particle in a box" wavefunction, is there a time-evolution of the gravitational field of the particle-in-a-box (as if the mass is moving) or is the mass consistently spread out over the wavefunction? More or less the same question but worded differently, if a particle-in-a-box is tunneling through a barrier, will its gravitational field look like the mass is spread out along the wavefunction and tunneling through the barrier, or will it appear to come from a point in space that's moving? TL;DR is the mass spread out over the wavefunction? [link] [comments]  |
| Posted: 18 Mar 2017 09:41 PM PDT I was wondering in the context of a particle accelerator. For example, some of the largest particle accelerators can produce beams on the scale of GeV or TeV, which is obviously very dangerous. What's the lower bound of that scale? How energetic can a beam be before it gets dangerous? [link] [comments]  |
| Posted: 18 Mar 2017 09:19 AM PDT |
| Why is cyanide an anion, but carbocations cations? Posted: 18 Mar 2017 09:16 AM PDT My chemistry teacher cited the fact that, in both cases, the carbon involved has too few covalent bonds (3 not 4) to explain each species' charge. Why is Cyanide negative but a carbocation positive? [link] [comments]  |
| Why can't we collapse a photon to its position eigenstate, stopping it all together? Posted: 18 Mar 2017 07:43 PM PDT In the Copenhagen interpretation of quantum mechanics, observations cause wave functions to collapse into eigenstates of that observation. A photon should be a wave function (a boson in particular), so why can't we observe it with the position observable to collapse it into a state where it is stationary? If we can, how do we work around this in order to appease relativity? [link] [comments]  |
| Posted: 18 Mar 2017 10:32 AM PDT |
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