Physics

If not, why not? If yes, in what way possible?

What gives the earth the ability to absorb large quantities of electrons. For instants discharge from lightning rods. Is there an electron deficiency? If so, why? Please a Thank you

We can measure visible light intensity using photoelectric effect. Electromagnetic wave hits the electrons on the solid surface, and the emitted electrons make current. Then, How we can measure the intensity of the short length electromagnetic wave or long length one?

The Earth's gravity field, like its magnetic field, seems to be a conglomerate field consisting of numerous point-centered sources of force. In the case of magnetism, the polarization of individual atoms seem to unify into a single (macro) magnetic field and I assume the same is the case for gravity, i.e. the macro gravitational field is a unified field constituted from the many tiny gravitational fields of individual particles of matter. Obviously two magnetic fields from two magnets can "pass through" each other and even intersect completely (at least relatively so to the extent that two magnets can be placed together with repellant poles facing each other. It a…

0 degree Celsius is useful for the measuring standard. How do we make it exactly?

I was thinking about how energy could become transformed into force and this is what I came up with: Consider a black hole as a pure gravity-emitter. Nevermind for the moment what happens with matter-energy once it falls into the black hole. The point is that when photons enter and get trapped, they must add to the gravitation emitted by the black hole, correct? Therefore, would it make sense to say that photons get converted into gravitation when they enter a black hole? Now could it be that black holes represent one version of a more general phenomenon: i.e. attractive fields that grow by consuming photons (and/or other matter-energy)? So, for example, could i…

Basically the title explains my question. Apparently the nuclear force holding the protons together in the nucleus is very strong but there must also be some repulsion as a result of the protons having the same (positive) charge. Does the nuclear force render the electrostatic repulsion practically meaningless or does it play some role? Maybe it only emerges during the fission process or when atoms get polarized magnetically? Maybe it regulates fusion in some way?

I'm looking for a material to place my laptop on while its on my lap as it gets hot. What material will best prevent the heat? I had aluminium in mind.... Thanks

Exactly what is in the title... I am confused..How can it be possible for all galaxies to appear to move away from the one you are using as the point of view? Looking from one galaxy it appears that the others move away but if you use many as your point of view how can they all move away from each other? If you universe began from a singularity how can it not have a centre...everything must have expanded from that singularity...therefore everything must be expanding evenly from 1 central point.

Hi, i was wondering how 'space' did not exist before the big bang, at the point where the universe is thought/known to have been just a microscopic singularity... because, then how did the singularity itself exist, or how was it able to be present - within existence - if there was nothing to exist in... because if it contained anything in the known universe, that is all of 'physical' reality, then how could there there be nothing outside of it.. hasnt it obviously expanded into a void of some sort, which is 'physical space' - to allow something 'physical' to exist and dynamically evolve in it.. because, if you, for arguments sake, went outside or beyond th…

Hello everyone, Ok I'm confused again (surprise). Let's say there is a semipermeable membrane and on one side there was 100 percent water. On the other side there are solutes mixed with water. Now water should move from high to low, but where is the water from 100 percent side going to move into. There are no gaps on other side, other side is full of water mixed with solutes. So why does it diffuse. Thanks

First of all, I hope that I have magnetism down. A magnetic field emerges when there is some harmonization among the electrons in the magnet such that the negative charge of (some of) the electrons occurs in unison away from the side where the protons' positive charge is dominant. I hope this is a somewhat accurate description. Now, as for the solid materiality of matter, this seems to be a result of the electrons as well. Only in this case, the electrons orbit the nuclei of the atoms constituting the matter in such a way that they are more or less random relative to one another and the result is that there is little or no magnetic field surrounding the object and …

Hi everyone, I was looking for some help with understanding how holograms work. In particular, the reflection holograms, artwork or those you find on credit cards that work with white light. As far as i understood, with holograms in general you only get a reconstruction of the object forming when the hologram is illuminated with the same coherent reference source used to create it. But with refelection holograms this is clearly not the case as you don't need a coherent OR monochromatic source to get an object forming. why is this? any help would be great. Tom

In a close system, when no.of mole of gas molecules increase, gas expansion happens, and its plug is being pushed outward. What i want to ask is that: Where does the energy comes from which does work on the plug?Does the energy come from the vibrational energy or translation energy of the molecules? Another question is that if no gas expansion is allowed in that system,what conclusion can I make by equation PV=nRT?Will the temperature,or the air pressure inside that system keep constant ?

a long time ago i read something about the fact that the North/South poles are a second slower or faster(?) than lands located about the equator. It suddenly just re-occurred to me and i am just wondering if it's true or not and (if it's true) why is it slower or faster?

The more distant a galaxy, the greater the redshift. But is that really a vaild support for the expanding universe? The farther a galaxy is, its light will have to travel farther distances. The farther it has to travel, it will have a greater chances of interacting with atoms/molecules in space-as a result of the interaction, it will have less energy(thus resulting a red wavelength). So is the red shift really doppler effect or simply just the interaction of light?

So...According to wikipedia and just about every other source there are 10 types of energy... Chemical Energy- CE Kinetic Energy-KE Thermal Energy-TE Light Energy-LE Gravitational Potential Energy-GPE Sound Energy- SE Electromagnetic Energy-EME Elastic potential Energy-EPE Nuclear Energy-NE Radiant Energy-RE (Why are we not told about this in school? It is the energy of electromagnetic waves which includes thermal radiation and light.) I disagree. SE for instance is vibration. Doesn't that make it a form KE? And shouldn't TE be split into KE and LE? [KE because of vibrating particles that transfer heat and LE because heat [in the form of radiation] is p…

Hello everyone, I'm confused with partial pressure of a gas. Wiki: In a mixture of ideal gases, each gas has a partial pressure which is the pressure which the gas would have if it alone occupied the volume. Now in a container if I have oxygen and carbon dioxide. If I remove carbon dioxide, shouldn't the oxygen occupy more space and its pressure decrease. So how can you call partial pressure of a gas pressure which the gas would have if it alone occupied the volume. Thanks

What's the fastest you figure a realistic rocket could go (must carry a human passenger)? And what basic design would it use? As for realistic, let's say that means it would cost less than 100 trillion including R&D through construction, over several years of course. And if the budget were only 1 trillion, how much slower would it be?

If one material have a higher band-gaps than the other material, will electrons from the higher band-gaps flow to the material with lower band-gaps? or does only the photon energies within the higher band-gaps flow to the other material with lower band-gaps?

I am wondering how does light from a distant star constantly reach Earth? the surface area of the star is far smaller than the surface area of a sphere that has a radius that's the distance between the star and Earth, so incoming light from the star should rarely hit any points in space on or near Earth. There is probably a very simple explanation to this which will make my question seem silly since my knowledge of Physics is pretty minimal at the moment. EDIT: there is obviously something important about light that i don't know because when the light from the star reaches Earth it would also have to hit every point on Earth that can be directly reached from t…

I disagree - classically we often also haven't full knowledge and to cope with it we use thermodynamical models which represent our knowledge, do you disagree? For example assuming Boltzmann distribution among possible scenarios: trajectories, what leads exactly to stationary probability distributions from Schroedinger's picture (like Feynman path integrals in imaginary time http://www.worldscibooks.com/etextbook/4443/4443_chap3_2.pdf ). ... and generally I would like to understand why when I've tried to discuss results claiming good agreement with experiment from dozens of peer-reviewed papers (with hundreds of citings) about such classical systems in e.g proton's E…

Okay this was just a random thought one day.. but think about this. If you were able to build a perfect ring around the earth, supported by beams, and then you took all the beams out at the same time. Would the ring float around the earth because of gravity? Or would it fall over, or spin around the earth??

I don't know if this would be a very accurate way to model the motion of electrons but I'll explain it and see what people think about it: First, think of taking 6 or so round magnets with a hole in the center and connecting them so that all the same poles are facing outward. Basically this would give you balls that would repel each other in all directions. Next. attach two or more of these balls to a "nucleus" that gets them revolving around a center-point, maybe using connecting rods. Now, if the two repellant balls were orbiting and could freely change direction to follow any path through the surface of the sphere they are confined to, how would their repe…

The Van der Waals equation of state for gases: [math]\left(p + \frac{n^2 a}{V^2}\right)\left(V-nb\right) = nRT[/math] where "a-prime" is the attractive force between gas particles. My question is, does "a-prime" already account for any paramagnetic interaction that may arise in gases with un-paried electrons like triplet [ce] O_2[/ce]? Or, does "a-prime" only factor in the Van der Waals (induced dipole-induced dipole) interactions present meaning that one would have to account for paramagnetic interactions separately? I realize one could neglect the paramagnetic interactions entirely for most purposes, obviously they shouldn't add up to much in the gas…