What keeps wi-fi waves from traveling more than a few hundred feet or so, what stops them from going forever? |
- What keeps wi-fi waves from traveling more than a few hundred feet or so, what stops them from going forever?
- When dogs of different colors breed their descendants can have patches of either color instead of a mixture. Why does that not happen on humans?
- What happens in the brain when a deaf (from birth) person reads?
- For exoplanets to be discovered using transit photometry, do they have to be in line with earth(does the planet have to pass between earth and its star)? If so, does this mean that planets that orbit in a plane where they don't pass between the earth and its star are undetectable?
- Are there any phenomena or patterns in the physical world which behave discontinuously (in a mathematical/topological sense)?
- Is there any particle that has no antiparticle-or is a particle with no antiparticle a possibility? Also, can anyone tell me what the difference is between a positive and negative electric charge/baryonic number and how it works etc, etc.
- How is a length contracted planet still in hydrostatic equilibrium?
- In the double and single slit experiment how small does the slit have to be before we notice the diffraction and interference patterns?
- What happens when a charged black hole evaporates?
- Can Moons Have Rings?
- Do photons exert force on objects?
- Would repetitive consumption of a incredibly hot pepper (Carolina Reaper, etc.) eventually yield lesser physical response?
- [Mathematics] The l_2 norm can be defined in a basis independent fashion, can other l_p norms be defined in this way?
- In carbon dating, why do we assume that the ratio of Carbon 14 and 12 in the atmosphere has always been the same? (or for the last 60,000 years)
- Why do things spinning clockwise give off the illusion of spinning the opposite way after a few seconds?
- How did Humans in the past know that a specific organ does this specific function in the body?
- How do we construct quantum logic gates?
- Does every living thing need to have DNA?
- Why does different elements freeze or melt at differemt temperatures?
- What happened to string theory?
| Posted: 08 Apr 2017 10:43 PM PDT |
| Posted: 08 Apr 2017 11:45 AM PDT I'm reading a story where people with different hair colors have kids the kids have hair in both colors (black with strands of blond) instead of a mixture of the colors (brown), similar to what happens in dogs and other animals. Why does that not happen to us? What causes it in other mammals? [link] [comments]  |
| What happens in the brain when a deaf (from birth) person reads? Posted: 08 Apr 2017 06:50 PM PDT I was thinking about how when I read silently to myself, I "hear" the words I'm reading in my head. When I read the word "window" I "hear" it, know what it is, and continue on. I don't "see" in my mind's eye a picture of a window unless I need to (e.g. to solve a puzzle I might picture various kinds of windows). Then I wondered, for someone who has never heard the the pronunciation of the word or know what it sounds like, what happens when they read the word "window"? Do they picture it in their mind's eye or does something else entirely different take place? [link] [comments]  |
| Posted: 09 Apr 2017 05:33 AM PDT |
| Posted: 09 Apr 2017 07:09 AM PDT 2nd-ary question: Is there a good reason from physics or philosophy which explains why continuity succeeds so well in describing real-world phenomena? [link] [comments]  |
| Posted: 09 Apr 2017 02:42 AM PDT I've heard that Photons are their own antiparticles but other than that is a particle with no antiparticle a possibility or does one exist. Also, what is the difference between positive and negative electric charge and baryonic numbers. What are they. And what causes them? [link] [comments]  |
| How is a length contracted planet still in hydrostatic equilibrium? Posted: 09 Apr 2017 01:33 AM PDT From an observer A stationary compared to earth, earths hydrostatic equilibrium is an almost spherical shape. In this shape, the electrical forces that pushes the atoms apart are the same as the gravitational forces that pushes them together (loosely speaking). An observer B moving very fast compared to earth will see earth length contracted, so it could in extreme cases be some kind of disc shape. This point of view should be physically equally valid. So from that point of view, hydrostatic equilibrium of earth will be this disc shape. Electric forces that push atoms apart and gravitational forces that push them together are still balancing each other out, just that this balance now causes earth to be in a very weird shape. So what is different about the earths matter, the electric forces or the gravitational forces, that causes hydrostatic equilibrium to be such a weird shape? I assume that probably every single atom is also length contracted. But how? The charge of the nucleus and the charge of the electron are still the same from B's point of view. So if he solves the schroedingers equation for that system, he would still get approximately spherical Orbitals, not disc-shape Orbitals. [link] [comments]  |
| Posted: 08 Apr 2017 02:45 PM PDT Does it depend on the radius of the beam of light as well? [link] [comments]  |
| What happens when a charged black hole evaporates? Posted: 08 Apr 2017 07:13 PM PDT BG: Black holes emit Hawking radiation, as photons, and the smaller the black hole the more it radiates until it finally disappears. What would happen if you fed a micro black hole electrons to give it a charge, then allowed it to evaporate? Photons can't carry a charge... Would some particles be left behind? [link] [comments]  |
| Posted: 08 Apr 2017 03:35 PM PDT |
| Do photons exert force on objects? Posted: 09 Apr 2017 07:13 AM PDT |
| Posted: 08 Apr 2017 06:31 PM PDT |
| Posted: 08 Apr 2017 05:04 PM PDT So I have a question I think I should've known from basic courses, but now I can't seem to find an answer anywhere. Say you have a vector space V, and assume that it is an inner product space (which for any physically meaningful situation I guess one can give V this structure). Then, the l_2 norm can be defined via the inner product without ever referring to a basis. Can one do this for other l_p norms? In particular, can one do this for the l_1 norm? What additional structure (such as the inner product in the l_2 case) does one need to be able to define the l_1 norm in a basis independent way? [link] [comments]  |
| Posted: 08 Apr 2017 10:17 AM PDT I'm not particularly scientifically literate, so please excuse me if my question doesn't make sense. [link] [comments]  |
| Posted: 08 Apr 2017 06:19 PM PDT Came to mind because I was spinning a fidget spinner :) [link] [comments]  |
| How did Humans in the past know that a specific organ does this specific function in the body? Posted: 08 Apr 2017 08:18 AM PDT How were we able to discover that the brain is the organ that controls most of the activities of the body? Without the present technology that we have, How were people in the past able to tell that brain is a most important organ? (Was it because they observed some person got hurt on the head and his whole body and mental health got affected ? ) Because before technology Just not the brain but also other organs.. And more important than this , How were they able to come up with medicines ? How did they know that this specific herb would cure this disease? [link] [comments]  |
| How do we construct quantum logic gates? Posted: 08 Apr 2017 09:21 AM PDT I can sort of imagine how a NOT gate could be constructed. But a controlled not gate (that does not involve a classical measurement) seems harder. And a phase rotation gate is hard for me to imagine. What process do we have that simply serves to rotate the complex phase of a wavefunction? [link] [comments]  |
| Does every living thing need to have DNA? Posted: 08 Apr 2017 11:53 AM PDT With the exception of RNA based "organisms" (like viruses, since they're not really considered alive). Does everything need to have DNA to be alive? Basically if we went to Europa and discovered life, would it be possible for the life that evolved on that planet to be DNA-less? Do we have DNA-less living organisms here on earth? [link] [comments]  |
| Why does different elements freeze or melt at differemt temperatures? Posted: 08 Apr 2017 11:21 AM PDT I bet it has a very obvious answer but I actually dont know the answer. [link] [comments]  |
| What happened to string theory? Posted: 08 Apr 2017 04:09 PM PDT So back when I took physics in high school, about 10 years ago now string theory (as far as I can remember) was one of the newer theory to try to tie the universe together. Just wondering if it has since been debunked or bolstered in recent years since I haven't really kept up with the field [link] [comments]  |
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