Quantum physics Definition and 717 Threads

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 =...

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...

So, I've had an argument with a friend of mine about how electrons behave in an electric circuit. He doesn't even know what quantum physics is and I have yet to explain it to him, but the question I'm asking my self is this: Let's say we have an electrical circuit similar to this one...

What is the significance of the number 137 in quantum physics?? What is the significance of the number 137 in quantum physics??

I am pretty sure that I'm doing this right but the integral for normalization seems impossible. Here is the question: Normalize this wave function. psi(x,t)=Axe^(-sqrt(km)/2h)*x^2))*e^(-i(3/2)(sqrt(k/m)*t) for -infinity<x<+infinity where k and A are constants and m is given. I used...

Hi, i have learned some basic principles of quantum physics and and know that quantum physics has led to improvements in computers and technology. But can someone please explain to me the details on how quantum theory has improved chip size or gave way to ipods, I am i even right? did quantum...

Basics on Quantum Physics... I have Two basic Questions which I need an easy, simple answer... First is...What is Spin of a particle? any simple way to define it?