Physics

What is the difference between field momentum and light pressure? Can both be equally well conceived independently of whether one adopts a wave or particle view?

How is polarisation depicted on a particle theory? Craig

When was a method for determining electromagnetic wavelength first employed, and what did it presuppose? How is it referred to on a particle theory? Craig

what is quantm tunnelling and how it is used to measure the probability of electrons

When we fail to move a heavy stone even after applying force, is work being done in this case? Is energy transformation taking place

Can anyone please help me about this that why an electron has a spin motion and what will happen if it stops spinning.

Matter and energy can't be created or destroyed, only transformed into other forms. It seems that matter and energy are interchangeable to some extent, but presumably the total amount of matter-energy in a system is conserved through all transformations of one form to the other. But what about force-fields? Can gravitation, electromagnetic force, and/or the nuclear forces be converted into one another? When matter is converted to energy, for example, some gravitational potential is presumably lost with the lost mass. Is this force-field converted into electromagnetic force in the form of radiation released? If so, is it possible that field-force could exhibit a s…

Hi guys, I'm having trouble, understanding the difference between AMPS and VOLTS, I'm not really good at electronics, My stronger points are astronomy and computer science. But I need help understanding, because I have two power supplies taken from old chargers, etc. I dont understand why a 9V 2.2A is more powerful than a 15V 1.2A charger? anyone care to explain? It is much appreciated if you help me. Thanks.

My questions are: Could the EM spectrum go beyond Radio waves? Waves with an approximate wavelength scale of longer than a building...perhaps as long as several kilometres... Is it possible for the wavelengths to get to long that they become a flat line? On the other end of the scale, Could there be waves as shorter than Atomic Nuclei? As short as Leptons/Quarks? Could they get so short as to stop in a vertical line? It's just that shouldn't the end of the spectrum be where the waves can't get any long and are just a flat line and where the waves are so short the stop at a flat vertical line? These may not be visible in nature [we would just have to see] but perh…

Is that really plasma?

The video http://www.youtube.com/watch?v=EXHlNyEtnAo&feature=related It does horrible job explaining nature of time of past has the video gets into time trevel.

The Universe as a Hologram by Michael Talbot I found this today sounds interesting.I was doing a google search for some thing and found this.

Hey there. First of all, hello to everyone! I'm new to the forums. I recently got my hands on a Mac machine and idly sitting there looking at the wallpaper, I got thinking as to the causes of the heptagons in this image (one on the blade of grass, one in the lower-left-center, etc): The explanation may be remarkably simple, I don't know. But I ask myself, why heptagons? Why not pentagons, or hexagons, or circles? And what causes this optical effect in the first place? Thanks in advance.

Why doesn't the electron spiral into the nucleus of the atom? Surely the electrostatic would cause this. I doesn't. Obviously. Thanks

I was wondering. Although its obvious and practically everyone knows it, but how is there no sound in space when, although there exists no medium capable which allows sound waves to propagate, there are 'virtual particles'.. shouldn't they allow the propagation of sound wave as they are particles after all ? Or is it that they are incapable of supporting sound wave because they only exist for brief periods of time, therefor not long enough for the sustenance and/or maintenance of the waves...

http://web.mit.edu/newsoffice/2010/solar-antenna-0913.html "The antenna consists of a fibrous rope about 10 micrometers (millionths of a meter) long and four micrometers thick, containing about 30 million carbon nanotubes. Strano’s team built, for the first time, a fiber made of two layers of nanotubes with different electrical properties — specifically, different bandgaps. In any material, electrons can exist at different energy levels. When a photon strikes the surface, it excites an electron to a higher energy level, which is specific to the material. The interaction between the energized electron and the hole it leaves behind is called an exciton, and the dif…

im just curious about this. could the basic form of energy be heat?

How plausible would it be to create an electromagnetic floor that would be able to be controlled at different intensities combined with an electromagnetic suit that would attract to the floor?

My friend, who has no scientific training but is otherwise pretty intelligent, texted me with: "Why is it when gasses collide they don't slow down at all? Shouldn't they eventually slow to the point that they become liquids?" I texted back saying that the only way they could slow down was if the kinetic energy was converted into some other form of energy, but I couldn't give a coherent explanation of why that doesn't ever happen - could anyone here help explain it?

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Hello everyone, I searched the net but I don't understand the difference. BLO0D FLOW ----------------------------------> 0% ........................................… saturation 0% ........................................… saturation WATER FLOW <------------------------------- Countercurrent BLO0D FLOW ----------------------------------> 0% ........................................… saturation 100%..................................… saturation WATER FLOW ---------------------------------> Concurrent I understand how equilibrium would be reached in concurrent but I don't understand how counter current maintains a concentration gradie…

someone told me that if u throw a baseball down the field, it will exhibit a wave-like properties( or basically every moving objects exhibit a wave-like properties) I'm just wondering if it's true or not

piezoelectric materials produce voltages in response to mechanical stress. But if you a constant stress, will it produces constant voltages?

http://web.mit.edu/newsoffice/2010/batteries-nanotubes-0621.html "positively charged lithium ions travel across the electrolyte to the cathode, producing an electric current"-from the article i don't understand how that produces electric current. (someone please help me with the basic.) "In the new battery electrode, carbon nanotubes — a form of pure carbon in which sheets of carbon atoms are rolled up into tiny tubes — “self-assemble” into a tightly bound structure that is porous at the nanometer scale (billionths of a meter). In addition, the carbon nanotubes have many oxygen groups on their surfaces, which can store a large number of lithium ions; this enabl…

if electricity can be generated through the motion of the bike's wheel, were,'t it generates more energy if it were to be placed on a car wheel?