What happens when we run out of space on the radio frequency spectrum(s)? |
- What happens when we run out of space on the radio frequency spectrum(s)?
- Why is it matter in the Sun's core can undergo fusion at 15 million degrees but our fusion reactors need to be 100+ million degrees?
- How hot would molten metal have to be to become a gas?
- Do oscillations truly go to zero, and if not, do we now how small they can decrease to?
- What's the difference between carbonite and carbon dioxide? They both have the same formula . . .
- Would it be right to say that semiconductors are produced by doping?
- I don't understand "Nuclear Radiation". How does it work and what separates it from other forms of matter/elements in our world that seem to make it so much more dangerous?
- Why do we consider that a e- n=3 in hydrogen atom has more energy than in n=1, when in reality the energy needed ionize the eletron is more in n=1 than in n=3? Why do eletrons have tendecy to go to lower states of energy? What do you consider a lower state of energy?
- If you turned on every power-hungry function of your phone, could it lose battery even while charging?
- What causes a light to burn out?
- What is the relationship of quantum field theory to quantum mechanics?
- Is it possible to divide the frequency of the light?
- Why do Faraday cages not block visible light?
- Why does the fusion of iron atoms absorb rather than result in energy ?
- What sort of velocities are expected from alpha and beta radiation particles?
- Why can't a microwave oven be made to cook more evenly?
- How do we know an electron is matter or antimatter?
- Why is the energy for a lightning bolt so much higher than what is expected from these capacitance equations?
- What's more effective at reflecting heat, a sheet of aluminum that is polished or a sheet of aluminum painted white?
- [Physics] Could one rip an electron from a neutral atom solely by applying a magnetic field?
| What happens when we run out of space on the radio frequency spectrum(s)? Posted: 04 Mar 2017 03:25 PM PST |
| Posted: 05 Mar 2017 04:27 AM PST |
| How hot would molten metal have to be to become a gas? Posted: 04 Mar 2017 05:05 PM PST So if I heat iron into molten iron. How much more would I have to heat it for it to become a gas? [link] [comments]  |
| Do oscillations truly go to zero, and if not, do we now how small they can decrease to? Posted: 04 Mar 2017 06:00 PM PST Consider a simple system of a 1 degree of freedom spring-mass/damper oscillator. When solving the differential equation that represents the equation of motion, we often get results that decay to a limit of 0 due to an exponential--i.e. overdamping, underdamping, and critical damping. I was wondering, do these ever truly go to zero? I realize it's most likely similar to cutting something in half over and over again trying to get to zero mass, but at SOME point you hit subatomic particles and can't get anywhere. So do we know of a point at which oscillations seem to stay at a constant value very near zero? More importantly, is my body still feeling that punch from the 3rd grade? [link] [comments]  |
| What's the difference between carbonite and carbon dioxide? They both have the same formula . . . Posted: 04 Mar 2017 05:54 PM PST |
| Would it be right to say that semiconductors are produced by doping? Posted: 04 Mar 2017 02:41 PM PST I'm doing some research on semiconductors, and I've gotten onto the subject of doping. It appears that doping creates the p-n junction found in semiconductors. Since this seems to be a vital part of semiconductors, would it be right to say that doping is the process in which semiconductors are produced? [link] [comments]  |
| Posted: 04 Mar 2017 11:39 AM PST I understand that it's 'bad', is most closely related nuclear power plant meltdowns and atomic bombs. But I don't understand HOW it works. Are there different types of radiation? Is the radiation our phones give off the same exact thing, except at a much lower level? What is happening to our body when radiation gives us cancer? Why do we use radiation therapy to cure cancer when it also gives us cancer. It also seems a property of it is that you can't really stop it - it seems like putting up walls or barriers is not effective unless they are ridiculously thick, and even then it seems like we just do that because we don't really know what else to do and it's better than nothing Basically just looking for Nuclear Radiation 101 explanation. [link] [comments]  |
| Posted: 05 Mar 2017 07:40 AM PST So.. what its bugging my mind is this.. N=3 has is suppose to be a higher energy leve than n=1 right?However in this level the ionization energy is lower than it is for n=1.As such shouldn´t it be that n=3 is a lower energy level than n=1? And how come eletrons have tendecy to go to a lower energy level?And what do you consider to be a low energy level? Do you consider a low energy level when eletrons are only subject to Zef?Like i can´t stop thinking about this.. What is a lower energy level.. I know schrodinger equation and all that stuff and how he gets it there mathematically.. i just want to understand though [link] [comments]  |
| Posted: 05 Mar 2017 07:36 AM PST |
| What causes a light to burn out? Posted: 05 Mar 2017 06:07 AM PST My wife always leaves the dryer door open. I have asked her not to, as I didn't want the tiny, hard to replace bulb inside to burn out. It finally did today, but she tells me it has nothing to do with how long it burns, but rather how many times it is turned on and off. There seems to be some logic in that, but I'm not willing to let my indignation go that easily. Does duration of burning play a role here and, if so, how big of one? [link] [comments]  |
| What is the relationship of quantum field theory to quantum mechanics? Posted: 04 Mar 2017 08:03 AM PST The way I see QM is as a sort of general "protocol" for making predictions at the quantum scale. First, choose a Hilbert space representing all the possible states of your system; then choose a self-adjoint operator A representing the variable you want to measure; find the eigenvalues and eigenvectors of A; use the Born rule to calculate the probability distribution; exponentiate iA to find the time evolution. My understanding of QFT is that it uses this protocol to model fields like the EM field, so that the basic procedure is the same; the difference is that you use classical fields as a guide for choosing Hilbert spaces and operators, and this leads to things like Feynman diagrams and whatnot. How correct is this? [link] [comments]  |
| Is it possible to divide the frequency of the light? Posted: 04 Mar 2017 04:51 PM PST In electronics there are devices named "frequency dividers" which basically reduce the frequency of the incoming signal by counting zero-crossings. For example 1000 Hz oscillation on the input could be turned into 500 Hz. Would it be somehow possible to sense the light as an oscillation and consequently divide its frequency to lower ones? Dare I say – audible ones? As I understand, it is actually tera-hertz range and regular electronics don't work well in such high frequencies. [link] [comments]  |
| Why do Faraday cages not block visible light? Posted: 04 Mar 2017 10:12 AM PST I know, really stupid question, but I can't find an answer nor reasonably work it out myself. Faraday cages block out electromagnetic fields, and radio signals. Radio signals are simply part of the radiation spectrum, which, visible light is also a part of, just a different frequency. I suppose I don't understand radiation as much as I wish I did, but could someone explain this in a qualitative or quantitative manner? (I'm an engineer so math won't be lost on me) [link] [comments]  |
| Why does the fusion of iron atoms absorb rather than result in energy ? Posted: 04 Mar 2017 07:06 PM PST Reading an article about the evolution of a star into a super nova I encountered these sentences, " The star forges progressively heavier elements until iron is created. But iron is not a stellar fuel. Fusing it with other atoms doesn't release energy; it saps it from its surroundings." (Science News 2/18/17 pg 22). I thought, evidently wrongly, that fusion always resulted in the conversion of matter to energy, so my question is why? [link] [comments]  |
| What sort of velocities are expected from alpha and beta radiation particles? Posted: 04 Mar 2017 10:32 PM PST A recent question here about how radiation works has got me thinking about radiation trajectories. I understand electromagnetic radiation would follow a pretty much straight trajectory, because it's pretty much photons, but what about the other massive types of radiation? I expect them to follow parabolas, but what is the usual initial velocity from the decay? Can we predict the sort of kinetic energies involved? [link] [comments]  |
| Why can't a microwave oven be made to cook more evenly? Posted: 04 Mar 2017 05:37 PM PST |
| How do we know an electron is matter or antimatter? Posted: 04 Mar 2017 03:03 PM PST I understand whether we define a particle as matter or antimatter is fairly arbitrary, but what is the reasoning behind classifying groups of particles together as matter / anti-matter? i.e why do we say both protons and electron are matter, and is it possible that protons are matter and electrons anti-matter? I'm hoping for some more insight into whether the matter anti-matter imbalance in the universe is just a mistaken assumption on what we classify as matter and anti-matter. [link] [comments]  |
| Posted: 04 Mar 2017 04:24 PM PST I have always been taught how lightning could be viewed as the discharge of a capacitor being the air between the clouds and the ground. So I was fiddling around with the equations: The equation for capacitance is: \[C = e_r e_0 A/d \] So if we assume:
C ~ 2.95*10-10 F We also know due to messing around with the equation that: \[W_{stored} = (1/2) CV^2 \] this Though if we put that equation in with the capacitance we got & assuming a voltage of about 3*105 V which is a fair assumption The energy stored in the capacitor is apparently ~ 13 J !! That seems much less than I would expect a lightning bolt to be or at least this 'capacitor' to store. I am wondering where I've messed up. Thanks for any help! (Also I am sorry if I'm completly wrong about most of this - only just teaching myself about capacitors) [link] [comments]  |
| Posted: 04 Mar 2017 07:47 AM PST I've been wondering if something that was polished to a mirror finish was better at not absorbing heat through light than something painted with pure white paint. Any responses are appreciated! [link] [comments]  |
| [Physics] Could one rip an electron from a neutral atom solely by applying a magnetic field? Posted: 04 Mar 2017 08:06 AM PST From outside the atom, there would be no net charge. However, if a magnetic field penetrates the boundaries of the atom, it should have differing effects on the nucleus and electron, correct? If this is true, how strong of an electric field would you have to produce to separate a hydrogen nucleus from an electron? [link] [comments]  |
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