Quantum physics Definition and 728 Threads

a. What do we know about any quantum-physical law, dictating 8 electrons in the outer atomic shell + the other shells' populations, including the 2 electrons in the innermost. Any physical theory behind these numbers, or just an empirical reality ? b. How reacting atoms 'choose' between...

Recently I have been looking into Fuzzy Theory which is a relatively new subset of logic and is closely related to probability theory. Fuzzy Theory right now is practically a "taboo science" with not many scholars too interested in it. However, I see this as a grand opportunity to jump into a...

Greetings, This evening as I write this post, I can not be more humble of a person. I am writing because I am on a quest for more knowledge. Early in the middle of 2009 I stumbled across a documentary with a couple well known physicists that peaked an old, long-let-go dream. What started...

Homework Statement Given a wire with length a and square base b x b (where a >> b), show that the first 1700 (approximately) levels of the electron in the wire are identical for the one dimensional box, when a = 1m and b = 1mm. Homework Equations I know that the allowed energies of...

Homework Statement A rectangular corral of widths Lx = L and Ly = 1.94L contains seven electrons. What multiple of h2/8mL2 gives the energy of the ground state of this system? Assume that the electrons do not interact with one another, and do not neglect spin. Homework Equations Enx,ny =...

I am currently a mathematics major in my third year of study, and I recently changed my minor from economics to physics, so I am taking physics courses at the second year level, including classical mechanics, e&m, etc, which are all going fine, and an introductory course in modern physics. This...

I once heard Michio Kaku talking about quantum information being the bright future in 50 years But I wasn't so sure if that QI = Quantum physics also is string theory part of quantum physics? what do you need to study in masters to specialize in string theory

Ok, not all of quantum physics. Mainly just the Double Slit Experiment or Wavefunctions in general. You only have 3 sentences to teach either one (or both) to an idiot (not me) and they can't be run on sentences either. This also has to be a math free explanation. It's not so much a...

Has there been work done exploring the possible connection between chaotic systems and quantum mechanics? Chaos basically tells us that an infinitesimal change in initial conditions, given enough time, will lead to complete different solutions - another way of stating that is over enough...

hi i have to deal with a question, that i do not understand fully: in my chemistry lesson, my teacher told me, that if you have an aromatic molecule and you put it into a time-constant magnetic field, this would cause electrons to move. if you are not that familiar with chemistry, all you...

After studying both areas of classical and quantum physics in some depth, I've reached the conclusion classical physics is more elegant and ingenious than quantum physics. Newton's law of gravitation is elegant because its sheer simplicity allows us to map the trajectory of satellites...

Homework Statement The first five ionization energies of hydrogen are 1312, 328, 146, 82 and 52 kJ/mol. Calculate the wawelength of the first three in Balmer series. Homework Equations Avokadro constant, NA = 6,022 x 1023 /mol Planck constant, h = 6,626 x 10-34Js speed of light, c =...

Hey I've been hearing about kids my age, interested in many of the same subjects as me, that have built crazy things i wouldn't have thought possible, ie: a particle accelerator or a fusion reactor. I'd love some ideas of what I could build, small or large scale, hard or easy, and a price...

So I'm looking for a decent book which I can use as a reference for now (and hopefully at some point read all the way through) on the mathematics of physics. And by "mathematics of physics" I mean a single book which covers the bases of most math needed for any undergraduate and maybe even the...

Hi, I understand how classical theory was wrong about blackbody radiation with the intensity reaching infinity as the frequency increased. However, I don't understand how the problem is solved with quantum physics. How does the fact that electromagnetic radiation be transferred as discrete...

Just wondering. Any thoughts ?

I want to be able to follow basic books for quantum physics to get a taste of some of the underlying principles. The problem is: I don't even know half of the symbols. So basically, what mathematical knowledge is needed to be able to follow the formulas and principles in a quite basic quantum...

Just as a general survey, who agrees with the theory of Entanglement (where everything is connected & is one)?? Also who agrees that everything is just energy? Like when you go down past the atomic scale and Planck scale you reach just pure energy. If you could explain why or why not you agree...

I am going into my second year as a physics major and I am trying to prepare myself for undergraduate and graduate courses in quantum physics so I am thinking about taking some Probability classes and I wanted to know would it be worth it to take a Probability Series with these features: MATH...

I am going into my second year as a physics major and I am trying to prepare myself for undergraduate and graduate courses in quantum physics so I am thinking about taking some Probability classes and I wanted to know would it be worth it to take a Probability Series with these features: MATH...

hi al..I have just now started to learn quantum physics! previously I had some part of it indirectly in my undergraduate electrical engineering.However,the math part seems to be difficult for me! I want to learn completely the math part.I need one such good material forlearning the math of...

I've gotten quite used to that light is both a wave and particle but how does it interact with objects?

I am aware that Dover has a compendium of some of the early works from 1907-1926 (I think), but I am looking for later ones, specifically the papers of Vladimir Fock in Z. Phys. where he develops the Fock operator, and the Dirac-Fock operator (these are from 1929-1931 I think). I can sort of...

Homework Statement A magnesium surface has a work function of 3.68 eV. Electromagnetic waves with a 215 nm wavelength strikes the surface and eject photoelectrons. Calculate the energy of the photoelectrons in Joules and in electron volts. W= 3.68 eV = 5.96x10-19 J wavelength= 215 nm =...

Homework Statement What would be the effect on the Schroedinger theory of changing the definition of total energy in the relation f = E/h by adding the constant rest mass energy of the particle? The answer needs to explain how the theory would alter or even if it would fit the theory. Sorry...

I wish to learn Quantum Physics and I want you to guide me to a book in Quantum Physics. Thank you.

Ok, based on quantum physics, it is possible to synchronize 2 particles. If, theoretically, you fly particle A out 1 light year away, while leaving particle B on earth, by the understood laws, if you flip the spin of B, A's spin should simultaneously flip. This would violate Einstein concept of...

I know absolutely nothing about physics. I know that classical mechanics is used in engineering and whatnot, but could anyone explain the uses of quantum physics?

I am going to have about quantum physics next year in my physics class, but it would be nice to know something about it before. Therefore am I wondering about what is Quantum physic. You don't have to tell everything about it, but the basic about it. :D

I'm a math major (pure math) but I'm very interested in taking a course in Quantum Physics. What should I expect as far as the math for such a course?

I am a student, and I want to do a science research project, simply for my own interest. I am very interested in quantum physics, however, I really don't know how to sculpt a project around it. I want to be original: I am interested specifically in quantum computing, quantum encryption, quantum...

Could it be that there is no way to unite quantum physics and (non quantum) physics, could that be why there has been so many problems and controversy over string theory? This would just help me understand string theory more and possibly help out my "pet theory" _ev

Homework Statement I have to confirm that d/dt \int Y1* Y2 = 0 So far I have used the product rule to get two expressions. Then I have used the TDSE to replace dY/dt and dY*/dt. I end up with the line: (i/\hbar) [ \int H* Y1* Y2 - \int Y1* H Y2 ] from here I'm not sure...

Homework Statement by considering the action of [p-hat (subscript x), H-hat] on a general state, show that [p-hat (subscript x), H-hat] =-ihbar dV/dx Homework Equations H-hat = (((p-hat)^2)/2m) +V(x) p-hat (subscript x)= -i*h d/dx (partial derivative) The Attempt at a...

Hi everybody, I've been wanting to learn quantum physics for quite some time, except I really don't know where to start. I already understand some of the concepts such as wave particle duality, and how all particles move through space as a Y wavefunction, which collapses into a definite...

Homework Statement Calculate the energy (in eV) of a 500 nm photon. Calculate the non-relativistic kinetic energy for a 500 nm electron. The Attempt at a Solution Eph=hf=hc/λ = (6.63E-34 J·s)(3E8)/(500E-9 m) = 3.98E-19 J = 2.49 eV I'm not sure why, but I thought that the energy of...

I couldn't determine exactly what section this should fit into, considering that it does cover philosophy and most likely violate the QM section I figured it's best here. If the Mods feel otherwise please let me know. I realize putting this thought to paper is like pinning a cloud to the...

What could be a good example or textbook problem which could be solved using quantum physics and classical physics in order to see the difference? If you wan to explain the differences to a non-physics student, what would you do? (Don´t use the blackbody radiation problem).

Does anyone know of a good place to look to take a course in quantum physics online? I am a teacher and recently did a unit on black holes, and I found them fascinating. My background is in liberal arts, but I think with a lot of work I could get through it. Thank you in advance for all who...

Can anyone tell me which subject should I start with for studying Quantum physics? and can I really understand some basics by self studying before college? Thank you

Hi! As a layman in quantum physics area i, without any sort of prejudice or judgement of any kind, would like to know how does quantum physics explain the phenomena of oracles.

Hello all, I'm an uneducated layman (physically and mathematically uneducated) new to the forum and to the whole concept of quantum physics, so apologies in advance if I sound stupid! :P I was listening to a talk recently where the speaker was trying to explain how small an atom was, he was...

Hi, My name is Paul and I have a question to pose that I feel you chaps may be able to help me with. Last night I was letting my mind wonder and I was thinking about Gravity and how I think it is an effect of a cumulated Quantum force. Remember it was just my mind wondering also I am not a...

I am having a tough time getting a coherent definition of what quantum physics is. What do you do in this field and where would you usually work? Are there any labs and facilities outside the U.S. that focus on quantum physics? What are people trying to find through this branch of...

hello, how can we be sure that quantum physics (uncertainty,superposition) is not a consequence or directly related to special relativity. for example particles spinning faster than light could explain many quantum effects, or i am wrong?

What are the basic rules of quantum physics and how does it work?

First off, I'm no scientist or physicist, I don't have a fancy degree, I'm a computer engineer with an absolute fascination with quantum physics and the unknown. I figured there must be some great minds here who can help me make sense of the theories I'm learning. My understanding so far, is...

hi! Every time i stumble upon quantum physics I get to the same example, where the subatomic particles (photons i suppose) behave like particles in a particle experiment, and waves in a wave experiment. Then the conclusion is that the particle becomes what the observer measures. I'm just...

What books/courses/topics would you say or recommend for the prerequisites to be able to fully understand Quantum Physics (or at least get started doing so)? I find that my school's courses are really slow for me and I want to get ahead so that I don't waste my time. I have finished...