Quantum physics Definition and 716 Threads

Hi everybody, First, I want to excuse myself for the mistakes in this message (and in the others that I will write), because I am not an english speaker and I am not accustomed to write in english. It is the reason why I come here, to improve my English :smile: . If I make a big mistake, I...

Hi all, I was reading John Gribbins book In search of shroedingers cat yesterday, and it got me thinking, I`m about to embark on a open university Degree in Physics. If you became specialised in quantum physics then what kind of jobs or career propects would you have, There are many jobs...

Hi again, Could someone explain a tiny bit about Balmer Lines to me? If I was asked what is the difference between the red Balmer Lines in Hydrogen and Deuterium, where would I begin? How do I know which energy level the electrons are in? If it's a red Balmer Line then I guess n = 2 for...

Haaaaaaay every body I want to ask about the Quantum Physics What is the Quantum talk about ?and how can I study and understand it?? Can I have answers ... Please:smile:

What is the significance of Quantum physics to spirituality?

hi. I am not a physicist and i have a question about quantum physics. If you shoot electrons towards a double slit and record what happens on the otherside. If you then burn the recording without ever watching it - would the electron act as if it wasnt being observed?

I was wondering if modern physics considers quantum mechanics that follows from the hysenberg principle to be actually the way the universe functions, or simply that it is the extent of what we can possibly know with observation. I mean it seems to me that most of quantum mechanics is saying...

so cud anyone please tell me wot kind of careers u can get from studying quantum physics in college, despite teaching? thanks

Does anyone know which is the smallest possible number n in order to take place (in free space) the following reaction: e+ + e- ---> nγ

How do we describe wave in Quantum Mechanics? Is it different from classical physics?

I am doing an English report for school and I am going over a lot of the basic theories of quantum mechanics. I was wondering if someone had a list of a lot of technological things made possible after the discover of quantum theory. I'd appreciate any help. Thanks a lot friends.

math is must commonly used in astrophysics and quantum physics? This might be a stupid question. Not sure

Hello, 1)I want to prove that the number of photons emitted per unit of surface of black body, per unit of time and per unit of space of frequency is: n(v,T)=(2*π*v^2)/[c^2*exp(h*v/k*T) - 1] Any ideas?! :rolleyes: 2)How can I find the wavelength as a function of the kinetic energy...

May I know what are the careers which are related with quantum physics?

hey everyone, i have a question I'm trying to solve here for class any help would be SO apreciated ! "In the Davisson-Germer experiment, 54.0-eV electrons were diffracted from a nickel lattice. if the first maximum in the diffraction pattern was observed at 50 degrees (as in the figure)...

:confused: Hello, i am new to quantum physics, i guess if someone could give me some advice about it, like websites, books or other types of information about quantum physics, as well as the basic physics and maths required to understand it...

I've been thinking about the difference between quantum physics and quantum mechanics. What are the difference? Is quantum physics just a subfield name, and within that there are quantum mechanics and quantum field theory etc. or are all of these three independent subfields of physics?

anyone know of a good quantum physics textbook?

A 1.5kg mass vibrates at an amplitude of 3cm on the end of a spring of spring constant 20N/m (a) If the energy of the spring is quantized, find its quantum number. (b) If n changes by 1, find the fractional change in energy of the spring. I have solved part (a) but I could not solve part...

Hey, I'm not a physicist at all, but I am aware of how good some crackpots are of getting media attention. I was just wondering if this has any legitimacy at all: http://www.guardian.co.uk/science/story/0,3605,1627424,00.html Does someone have a more detailed article about this theory...

I am having trouble with 2 problems about the harmonic oscilator. I realize this isn't the homework section, however I feel that in my situation where time is limited, perhaps someone would be able to give me a certain amount of leeway. First of all the question tells me to use the wave...

In quantum physics light is considered both (or neither) a probability wave and a photon. But where does the eletromagnetic wave come into the scheme of things in quantum physics? Is the electomagnetic wave merely an approximation to many different types of discrete photons (ranked by their...

I have this debate with my colleges several times and I can't stress how much I would like to get this settled. Quantum Mechanics is STRICTLY done by math. While quantum physics could be any where from the general therios which you experiment and debate and do all kinds of scientist like stuff...

A proof of RH using quantum physics...:) Here you are a proof of Riemann hypothesis, using quantum physics,first we associate the roots of the Riemann function \zeta(1/2+is) with the energies of a certain Hamiltonian with potential V and we prove v is real so all the energies will be real and...

Hi quantum people :smile: , I am so interested in quantum physics. I want to study this subject on my own. I have taken these math classes: Pre-Calculus Calculus I Calculus II Calculus III Differential Equations Linear Algebra Probability and Statistics And these physics courses...

HELLO FRIENDS, I am rakesh an student of quantum physics... LAST week i had a presentation on quantum physics this is a PPt of my talk...just have a look... n do reply...

Hi All, I’m sorry if this is a silly question, but can someone please tell me what the difference between Quantum physics and Quantum Mechanics is? Thanks Warrick

is messiah quantum physics textbook good? is it recommended?

My questions are next: 1.What would happen if you try to travel with spacecraft exactly at the speed of light? Yes, I do know that when spacecraft trie to reach the speed of light its mass will increase immensely...,my question is what would happen to the spacecraft that is trying to...

I read on some physics website somewhere (I forgot which one) that a magnetic field around a bar magnet exists because there is a tiny probability that some electrons exist outside the bar magnet and when they do they emit virtual photons that can interact with other things to create the...

i'm a green hand in this field,maybe the question i asked is droll,but i want to know some wonder thing about quantum physics. i know that one dimensional potential trap can be reckoned from Schrodinger equotion, but what about the actually fact? How dose one dimensional potential trap form...

http://arxiv.org/abs/quant-ph/0505187 Quantum Physics from A to Z Authors: M. Arndt, M. Aspelmeyer, H. J. Bernstein, R. Bertlmann, C. Brukner, J. P. Dowling, A. Ekert, D. M. Greenberger, M. A. Horne, T. Jennewein, P. G. Kwiat, J.-W. Pan, E. M. Rasel, H. Rauch, T. G. Rudolph, C. Salomon, A...

My husband wants to teach himself quantum physics. What books do you recomend? I want to get him a few for his birthday. Thanks

To those who come close to understanding the quantum world, what does it mean to you? I mean what difference has it made in your view of the universe? I understand that people have interpreted it in many ways, and not everyone agrees, but there must be some general consensus about what it's...

In a photoelectric experiment, light is incident on a metal surfact. Photoelectrons are ejected, producing a current. A reverse potantial is applied and adjusted until the current drops to 0 (this is called the stopping potential). This fata is collected for stopping potentials (listed first)...

Quantum Physics... And you thought this thread was going to be serious.[/size] Anyway ... finally, today quantum physics was started in my college lectures. Most people in the room hated the sound of it but I was ready to go. After the lesson my friend said 'I didn't realize quantum...

Hi A huge problem I'm finding with my study of QM is that its shrouded in maths and I'm becoming really bogged down in trying to understand things like hermite polynomials, assosiated legendre polymials, bessels and laguerres equations and so on. In the process, I feel that I'm loosing sight...

o:) Hey I'm Kristine & I was watching a show last night. It was called NOVA (It's about science), which this episode aired on channel: #50! It was on Quantum Physics / Quantum Mechanics. Which was probably over my head, considering that I'm in the 10th grade & am currently taking an Earth...

Quantum Physics and the "Real" World Could it be argued that the four energy levels of an atom relate to states of matter in our macro world? For example something is a solid, then you bump it up an energy level and it becomes liquid, bump it up again and it becomes gas, again and it becomes...

What would be the prerequisites before learning quantum physics? Type of math, normal physics, etc.

Well, a week ago my Professor said the space of quantum physical states was a Hilbert space. Thing is, he just said it, and moved on. So I have a vector space with a scalar product. Is it, indeed, Hilbert? That is, is it complete? I guess I'll see the answer next semester, in real functions...

When I'm in a dimension higher than 1, do I need to integrate over all space (V) or only the x axis? Thanks in advance.

here are another questions,I need someone to help me! (1)A metal work a work function of 2.40 eV is illuminated with a beam of monochromatic light.The stopping potential for the emmited electrons is 2.50 V.What is the wavelength of the light in nanometer? (2)What is the lowest frequency of...

Quantum physics movie -- What the *$@! are we thinking? And upcoming movie.. My friend who is learning calculus and physics, and I teach him what I know, works at movie theatre. He told me about a new movie in 2004, called "What the fuc* are we thinking?" It's about quantum physics and...

people are talking about Quantum physics and many such things.But what thay are proving now is what is already told by spiritual leaders of Hinduism,taoism long time back...where is this leading to?

Quantum Physics Questions!Very Very urgent please please respond a) A student obserbs the LED from a distance of 0.20 m.The pupil of her eye has a diameter of 0.6mm.Calculate the no of photons which enter her eye /sec?? Plz give me some hint and i'll try to solve it. b)Explain in terms of...

Well, unlike other areas of physics where the rules are predictable 100% of the time and every aspect can be known with definite precision, quantum dynamics is not as elegant. For example, we can know the position of a an electron, but not it's speed or so on, or something like that. Perhaps...

Hi all, I started on my physics program this semester. But things begin to puzzle me much, especially quantum mechanics. I hope that you wuold take the time to answer a few of my puzzles. I used Sakurai's book in my quantum mechanics course. It is said that in the position space, the...

hola. i have to do a report comparing Newtonian physics to quantum physics. are there any good sites or other resources that you know of? thanks

Is it possible to specify cellular biology by incorperating the laws of quantum physics?