Quantum Theory

Hi all. i can't quite figure out how to modify the equation for this alpha particle decay stuff....any ideas ? i think i need to modify this equation: anyway, help would be great! thanks guys & gals Sarah

i, wonder if J von Neumann saw anything in C Hermite mathematics when developing his own formulations of QM physics, c1950

What If, and this is a big If, the ENTIRE UNIVERSE were consumed by black hole, would it still evaporate? This question drives me crazy?

Ok, I used the search funtion, and this hasn't been posted before. Just a few comments/questions about scifi tech. On Warp Drive: The DK Space Encyclopeida talks about Star Trek and 'antimatter engines' as being rocket like. This is not explicitly stated but it is implied; as that's the only conclusion, at least in my eyes. Disambiguation: From what I understand, this is the process of warp as used by the Enterprise:

I can't imagine a very long photon travelling like, is it it just a particle that campletes its cycle (like spin or frequency) at longer distant or a really lonnng discrete string that vibrating, or, otherwise? So, in consider of photoelectric, diffraction, interference, resonance heating... what is that length of wave is mean?

Hello, Can someone please explaine what is law of conservation of probablity in lay-man and mathamatical terms. Thanks.

Thought some of you may find this useful, dug it up from my bot list. Looks interesting I'll watch them in my free lessons tomorrow http://bethe.cornell.edu/ Cheers and enjoy! Ryan Jones

We had forecast polls last year to see who could predict closest to future research output and citations. Yourda and Luc won a couple http://www.scienceforums.net/forums/showthread.php?t=18514 Now I want to determine the winner in the 2005 STRING CITATIONS forecast contest. I think it may be MacSwell, I have to check. STRING CITATIONS was not an easy one to guess, the details are here http://scienceforums.net/forums/showpost.php?p=184908&postcount=18 "recent" was defined as meaning that the paper appeared sometime in the past 5 years. The thing to predict was HOW MANY RECENT STRING PAPERS WOULD GARNER 125+ CITATIONS IN 2005. It used to be, w…

Yay, or something. http://news.bbc.co.uk/2/hi/science/nature/4862112.stm

namely what is it, My friend and I are trying to write a wikipedia article on the subject and need some help finding a clear definition of what a fermi point is.

I just wanted to recommend a couple of really good movies that talk about quantum physics. "What the bleep do we know" and "www.whatisthesecret.com" Both awesome movies - They talk about the power of our thoughts, and the universal law of attraction. What the bleep touches on the basic principles of quantum physics. Has anyone else seen these and want to recommend others like it? Cheers!

I know that quantum phenomena (superposition, uncertainty principle, quantum entanglement, probablistic outcomes, etc.) is readily observed in measurements of the states of fundamental particles. How readily are these phenomena observed at higher scales? Take atoms, for example. Has anyone ever observed atoms in superposition? What about complex molecules? Groups of molecules? How far up the ladder of scale can one go before quantum phenomena become practically unobservable?

What is it that the supposed graviton is supposed to do to cause gravity? Does it coinside with relativity ie: does the actual graviton particle repel space-time? Any help would be awesome..

Something I was wondering about after reading Brian Greene's "Fabric of the Cosmos" book. He says that if the Universe is a three-brane, why haven't we noticed? Because the three-brane is completely transparent to electromagnetic radiation, which is the only thing we canuse to detect the Universe around us (Photons being open strings that are forever stuck, attached to this three-brane). Something made me think... The Higgs field creates mass in everything except for the photon (and something else if I remember correctly - the gluon?) Maybe it's the same kind of effect, but manifested in different ways. What I mean is that could the three-brane be made ou…

Could somebody please explain the details of the string theory using fairly simple terms? I have tried researching this, but every web site uses complex terms and phrases that don't make sense to me. I also couldn't find a good explanation in any SFN threads. Are strings the building blocks of matter, smaller than atoms? What are they? What are their properties?

Assuming an empty universe with only 1 sphereical mass. Therefore by newtonian and relativity theories, there are no interactions with (to/from) this sphereical mass whatsoever. Assuming also, that parallel universes have no mass also and have no interaction with the current universe in question. Assume also QM theories are right and gravitons exist. So in this case, will gravitons essentially 'run out' because it is constantly ejected into space (with the assumption that energy/matter is conserved and graviton is essentially energy/matter; and that the mass of the sphere is finite). Also because there are no other interactions with other forms of mass and energy in o…

hey all, just having a bit of trouble with this question: what i think i have figured out so far is that, V(x) = 0 (because its a free particle) and i am also thinking that i should be using the time dependent SE? would anyone be able to me a pointer in the right direction? Cheers Sarah

Hello Physics Fans. now heres a question i hope someone could enlighten me. the quantum cat expirenment* says that by observing the event, we are changing it. we are forcing the cat out of its super position. now we do this when we observe it. but what level of intelegance forces it out of superpostion. shouldnt the can be able to observe? if we picked out our individual atoms we will get fine atomic dust which would have never been alive. so we are actually just a gathering of moving particles. these partlces are already there in the experiment box so what is different? and is this only from out point of observation. any awnsers will be gratfully appreciated. …

From what i understand particles just like light can also be represented as waves. But since you can combine electromagnetic waves ( eg light) to make a differnt wave pattern, which basicly means they exist on top of each other. Can particles ei electrons, do the same? Meaning co-exist in exactly the same place.

Question about quantum uncertainty and a singularity. If a black holes center is infinitely small then if matter falls in is it not certain that the matter can be found in that small space, in other words does it violate the theory of quantum uncertainty? Also, the “spacetime jitters” that are thought to exist at scales smaller then Plank’s length, would these be amplified inside the black hole thus stopping you theoretically (because you simply can’t) using a singularity to probe something in scales smaller then the planks length (Which should not be allowed should it?) Cheers, Ryan Jones

I`ve been doing a little reading about the first linear accelerators in the 30`s by Cocroft and walton and am really quite astonished how Simple the idea is in principal an equaly surprised that voltages as little as 700kv are perfectly acceptable, I really thought the voltage required would be in the order of several Mev at minimun. can these be scaled down even further? say test tube sized at 10s of Kv? I`ve had an idea for some time now as to what would happen if say some Am241 were placed as the Cathode in a thermionic valve type structure with a variable metal target Anode and then sufficient voltage pumped through this (similar to an X-Ray tube). I have…

I`ll soon be getting yet another 50mw laser to my "collection", is there anyway of converging these beams into one single beam with the combined power of all used:confused:

Why do we have to create a temperature so cold before quantum condensates can be experienced? Obviously that's where the thermal energies die away sufficiently but why are the magnitudes such? In solid superconducting materials (2 or 3 elements) temperatures can be higher but still cryogenic. There you have a captured electron cloud.

In the bohr model of an atom, orbiting electrons exist in orbits that have discrete quantized energy levels. Do these levels correspond to the s p and d orbitals of an atom?

I was thinking about this while walking home yesterday, and it bugged me: how does quantum entanglement work in regards to time and relativity? We know from relatively, if you have a watch on earth synched to a watch that goes around in orbit for a good while, the watch that has been accelerating and spinning around the earth in orbit, will show an earlier time, because time will have slowed during it's trip from it's vantage point. But what happens if we have entangled particles instead of watches in the experiment. Something you do to particle A has an instant result on particle B, and visa versa. So, A) while undergoing the acceleration, would particl…