Is there a limit to how many photons you can pack into a beam of defined width? Or to ask the other way - can an infinite number of photons occupy the same space? |
- Is there a limit to how many photons you can pack into a beam of defined width? Or to ask the other way - can an infinite number of photons occupy the same space?
- How does sorting by "Relevance" work? How does a computer determine what's relevant and what isn't?
- What is energy?
- Has there been any attempt to create one of the elements thought to be in the island of stability?
- What would happen if you took dry ice to the deepest part of the ocean?
- Anyone know where I can find a reference to cube/box (3D) in uniform electric field with numerical results?
- What is a "finite" Reynold number flow? As opposed to infinite?
- Why does heat capacity generally goes up with temperature?
- How do scientists still find new elements?
- What is the difference between straight hair and curly hair?
- How is it even possible to detect a star that's 13 billion light years away if inverse-square law is true, if my math is correct all the photons would dissipate (disperse) (not be detectable in a point in space) well before they reach even 1 billion ly in a 3 dimensional field?
- How long does airway endothelial metaplasia take to develop?
- Does sound travel differently depending on how much light is present?
- Rockets need to expell mass to go forward, but if you expell the mass at greater speed then less mass need to be expelled, couldn't Rockets just expell the mass at very high velocity to reduce the amount off mass needed to be carried?
- Ask Anything Wednesday - Engineering, Mathematics, Computer Science
- How do neurons fire phasically without ligand gated channels being opened? (as oppose to firing when glutamate binds their receptors)
- Why do some planets have rings whereas others don't? Could Earth have a ring(s)?
- I was just linked to NASA's Clean Air Study. Are there any known plants that would clean other toxins or even debris from the air?
- How good were the optics in Galileo's telescope compared to today's cheap telescopes?
- Is there a way to explain classical physics using quantum physics?
- If I weigh X and add Y weight to my body during exercise, do I burn the same calories as a person who weights X+Y?
- Why isn't the F-wave seen in Nerve Conduction Studies prevented by the refractory period?
| Posted: 09 Jun 2016 05:06 AM PDT |
| How does sorting by "Relevance" work? How does a computer determine what's relevant and what isn't? Posted: 09 Jun 2016 06:05 AM PDT A lot of search tools let you change the thing you sort by. You can look at the most recent, the newest, or the most popular, and I can understand the criteria they're sorting by. But sometimes you have a sort by "relevance" option (like this), and I don't understand what that's doing. And just to be specific, I'm not talking about algorithms like pagerank that can use outside information like cross linking to determine the weights of specific entries, but specifically something like reddit's search, that only has the entries themselves to determine relevance from. Unless, of course, that's how all of these relevance sorts work on the back end. [link] [comments]  |
| Posted: 08 Jun 2016 04:47 PM PDT All of matter is just energy, we look at it closer and closer, and we get to something like quantum foam or the vacuum energy. Isn't this just a measurement of energy? It doesn't really tell us what energy is. So what exactly is energy? [link] [comments]  |
| Has there been any attempt to create one of the elements thought to be in the island of stability? Posted: 08 Jun 2016 02:40 PM PDT Is it even possible to create such large nuclei? How does one go about to create one? [link] [comments]  |
| What would happen if you took dry ice to the deepest part of the ocean? Posted: 08 Jun 2016 05:47 PM PDT Would it bubble just like it would in 5 feet of water or could the immense pressures keep it solid or force it to be a liquid instead of sublimating? [link] [comments]  |
| Posted: 09 Jun 2016 01:50 AM PDT Hi! I hope this is the right subreddit. I'm doing simulations where we look at a conducting (aluminium) cube and its effects on the external uniform electric field (essentially parallel plates with a conducting object inbetween) and I'm having a really hard time finding any numerical results to compare with. A sphere was not a issue and simulations are agreeing with the analytical solution, but I also want to have some sort of reference to a cube/box in a field. If anyone could point me in the right direction to an article or similar that would be very helpful. [link] [comments]  |
| What is a "finite" Reynold number flow? As opposed to infinite? Posted: 09 Jun 2016 06:18 AM PDT This is in a paper I am reading. I understand that Reynold number is directly correlated with turbulence, so would an infinite Reynold number just mean something is infinitely turbulent? This seems pointless to say, since turbulence can't be infinite, correct? Thanks. I am flairing as Physics, but the paper I am reading is about biology, and this also has mathematics applications I suspect. [link] [comments]  |
| Why does heat capacity generally goes up with temperature? Posted: 08 Jun 2016 05:48 PM PDT Hello Reddit, first time here! I understand that heat capacities need to go to infinity as one approaches the boiling/melting of a given substance, but why does it always have to increase? In other words, is there a physical explanation for why dCp/dT>0 for all T different from boiling/melting points? [link] [comments]  |
| How do scientists still find new elements? Posted: 09 Jun 2016 04:25 AM PDT |
| What is the difference between straight hair and curly hair? Posted: 08 Jun 2016 03:06 PM PDT I was wondering about the physical difference, if any, between curly hair and straight hair. [link] [comments]  |
| Posted: 08 Jun 2016 12:54 PM PDT |
| How long does airway endothelial metaplasia take to develop? Posted: 08 Jun 2016 04:27 PM PDT I just read in my paramedic text book about simple squamous cells replacing columnar and cuboidal cells in the airway in chronic smokers. How long does this process take to occur and then return to normal? [link] [comments]  |
| Does sound travel differently depending on how much light is present? Posted: 08 Jun 2016 03:15 PM PDT |
| Posted: 08 Jun 2016 02:51 PM PDT The biggest problem with rockets is that they need to carry a large amount of fuel, but what I'm wondering is that a possible future solution to this is to use ion drives that use magnets to expell some amount off mass but to just use a nuclear reactor to increase the amount of energy in the magnets and expell the mass at higher speed to carry less off it. Also could it then be possible to expell only a few particles at extremely high velocity to only have to carry an extremely low amount or am I missing something? Now I know that you can't expell the mass at or beyond the speed of light but even then you can still add and ever increasing amount of energy and therefore momentum giving you greater thrust. Is this possible or is there some physical reason of why it can't happen, I'm speaking from a purely hypothetical standpoint and using technology in the distant future, maybe using super conducting magnets or something. I would love to know some thoughts on this. Thank you P. S. I'm new to reddit so I'd just like to say hi and sorry if I'm doing something wrong, I'm not too clear yet on the rules :) [link] [comments]  |
| Ask Anything Wednesday - Engineering, Mathematics, Computer Science Posted: 08 Jun 2016 08:05 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Engineering, Mathematics, Computer Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| Posted: 08 Jun 2016 03:31 PM PDT |
| Why do some planets have rings whereas others don't? Could Earth have a ring(s)? Posted: 08 Jun 2016 10:29 AM PDT |
| Posted: 08 Jun 2016 02:54 PM PDT NASA's study looked at benzene, formaldehyde, trichloroethylene, xylene, toluene, and ammonia. Let me know if I should change the flair to chemistry. [link] [comments]  |
| How good were the optics in Galileo's telescope compared to today's cheap telescopes? Posted: 08 Jun 2016 05:32 AM PDT Amateur astronomers try to warn well-meaning parents away from the $50 Wal Mart telescopes, with good reason. However, the telescope that Galileo used would have had limited optics compared to what's available to a well-funded amateur today, and he saw quite a lot with it. How would Galileo's telescope compare to the cheap end of today's models? [link] [comments]  |
| Is there a way to explain classical physics using quantum physics? Posted: 08 Jun 2016 08:48 AM PDT For instance, how are you able to explain how a box moves with applied force? Is quantum physics limited only to the very small? [link] [comments]  |
| Posted: 08 Jun 2016 12:31 PM PDT For example, suppose I weigh 200 pounds and add a 20 pound weighted vest to my body. Do I burn the calories of a 220-pound person, or am I burning the calories of a 200-pound person who is carrying around 20 pounds of weight? Or, is there even any difference? [link] [comments]  |
| Why isn't the F-wave seen in Nerve Conduction Studies prevented by the refractory period? Posted: 08 Jun 2016 10:15 AM PDT From my understanding of action potentials this shouldn't be possible. [link] [comments]  |
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