Levels Definition and 471 Threads

How would you use excitation levels (or the lowest excitation level) to find the radius of a nucleus? And how would it differ to using the r=r0A^(1/3) formula?

Homework Statement Determine the energy levels, their degeneracy and wave functions (in ket notation) of a particle with spin quantum number s =1 if the Hamiltonian is AS_x^2 + AS_y^2 + B S_z^2 where A and B are constants. The Attempt at a Solution' I've spent ages thinking about this...

Homework Statement You have a "U-shaped" container with a valve at the bottom of a negligible volume tube. The left side is filled with water and the right side is filled with mercury. The valve is opened and since the two are immiscible there is a fluid level differentiation. Determine the...

Hi all, It is my understanding that the color of a material results from the inability (or lesser ability) to absorb in that particular wavelength. Reading Atkins' "Physical Chemistry" (8th ed.), I run into a statement I couldn't quite get. On page 730 (chap. 20), he states the following...

Hello all! My professor talked about the quasi fermi levels in my Photonics class. While he did make a good effort, I still am not able to understand the concept. I do plan on going to him on Tuesday to get a clearer idea. But I was wondering if any of you folks could give a general...

Hello Enuma et als. I have a few related questions regarding Prediction Intervals for outliers (individual data points). The basic formula that I use is: Mean +/- T(-1df)*sd*sqrt(1+1/n), where Mean is the sample mean, T is the Z-score from the Student's T Distribution Table minus 1 degree of...

Hi there. It is a fact that, historically, the Schrodinger Equation provides wrong energy levels for the Hydrogen Atom. The same is for The Relativistic Schrodinger Equation (hehe, this is not known by most of students, seek it in arxiv database, it was the original developed by Schrodinger...

A muonium is an atom consisting of a proton and a muon. A muon has the same charge as an electron but about 200x the mass of an electron. Conceptually, how does it make sense that the energy of the first orbit of a muonium is more negative than that of a hydrogen?

Hello, I really need help with this question. Continuum is when the proton/electrons exist in the continuous band of energy levels above the highest bound energy level of the atom. What can be said about the combined energies of the proton and electron is the hydrogen atom is in...

Why the three-levels laser require high energy to start the inversion population? Please answer without mathematical details because I know the solution mathematically, I want the answer physically Thanks

if all the ice sticking out of the water from only the icebergs were to melt, would the water level go up or down?

Some satelites is just hanging there in a geostationary position, like TV satelites, communication satelites etc. Some other satelites are moving around the Earth with a time for rotating around the Earth like something like 2-3 hours (??!) How can this be, some of then is just hanging...

1.in band diagrams, books usually show parabolic bands for the conduction band and the valence band. They will also make note of the acceptor and donor leves in the band gap. However, they always draw straight horizontal lines for these levels. Is that correct? The impurity levels are...

I was wondering how much kinetic energy needs to occur in atom until it emits a photon. For example if you accelerate an atom (like LINAC) what energy and speed is needed for it to emit energy? Or if you heat/vibrate up a copper plate and it starts to glow, what kinetic energy is needed for the...

Homework Statement What does the line spectrum reveal about the energy levels in an atom? The Attempt at a Solution The energy levels are quantized is that right?

for my question , i will use the term 'level' hey , we know that the zone we live in is made up of atoms (level 0), which are made up of protons, electrons, neutrons , ect (level 1) - for electrons : are there any level 2 known , or nearly found , or theory ? for protons and neutrons we know...

I am looking to calculate the energy gap of for starters periodic elements and were wondering how we could get the list and calculation. Is there a table somewhere based on certain temperatures and constants of energy gap level? We would like to get a list of the energy gap energy for valance...

Hello everybody. As you surely know, the Schodinger treatment of the Hydrogen Atom gives wrong eigenvalues for the Spectrum. The Dirac equation provides for a correct one. On the other hand, the first who found the correct expression for the levels was "mighty" Sommerfeld using a mixture of...

A sample of silicon is doped with indium for which the electron acceptor level is 0.16eV above the top of the valence band. What impurity density would cause the fermi level to coincide with the impurity level at 300K? What fraction of the acceptor levels is then filled? What are the majority...

OK I'm sorry if this may seem like an extremely elementary question, but i just want to get it straight. What are the levels of college education and how long do they take. I know that most basic is associates (2 years) then bachelaurete (4 years & does not require associates degree)...

http://news.independent.co.uk/uk/this_britain/article2171679.ece

Energy levels of a particle in cubic box with sides length a are: E= [(h^2 pi^2)/(2 m a^2)] * (nx^2 + ny^2 + nz^2) where nx, ny, nz are integers 0. If 10 electrons are placed in this box, what is the lowest possible total energy of all the electron? ......... I am finding this...

Homework Statement What values of n are involved in the transition that gives the rise to the emission of a 388-nm photon from hydrogen gas? Homework Equations n=? wavelength = 388nm=3.88x10^-7 m R=1.097x10^7 m^-1 E= hc/ wavelength The Attempt at a Solution E= hc/...

From what I have been reading, the reflection of light from an object, like th eyellow color of sulfur is the same phenomenon as Rayleigh scattering. It seems that the electrons receive the incoming photon and are raised to a higher "virtual energy state." When they return to the ground state...

Im doing a paper on Bohr Energy levels and I need help. The most I can find about the Bohr models are about its radius, velocities, and such. Is there any links that can explain to me clearly the whole concept of the energy levels and all equations attributed with it, if any.

I'm supposed to calculate the rotational energy levels of NH3, which is a symmetric rotator. The rotational energy levels are determined by the equation E[SIZE="1"]JK = hcBJ(J+1) + hc(A-B)K^2, where J = 0, 1, 2,..., and K = 0, +/-1, +/-2,..., +/-J I don't quite get it. Are there a very...

Question 15. (a) Show that the difference in decibel levels, B1 and B2, of a sound source is related to the ratio of its distances, r1 and r2, from the receivers by B2 - B1 = 20 log (r1/r2) (b) A speaker is placed between two observers who are 110 m apart, along the line connecting them. If...

Hey guys, this isn't really homework but will help me on the exam and the homework too. We are working in the book, where you just get to electron structure, orbitals, configurations, etc. The part that I need help with is Quantum Numbers. My book has: n(principal energy levels)...

I hope they have a plan to get our troops out of there if necessary.:rolleyes: They are asking too much from too few for too long. http://www.msnbc.msn.com/id/15220816/

Solving the Schrödinger equation in spherical coordinates for a diatomic gas, one finds that the rotational energy leves are given by: \epsilon_l=K\cdot l(l+1) where l=0,1,2... is the rotational quantum number and K is a constant. It is said that each energy level shows a degeneracy of...

Hi guys, I've got a little conceptual question here. I became a little confused after my exam. Firstly, I understand that in the photoelectric effect, the electrons either accept all or none of the energy from the particular incident photon and the photon must have a minimum frequency...

Hello all, I wonder if anyone can help me with a problem I don't understand about atomic levels. Given an excited state of He with electronic config (1s,2p), I need to find all possible atomic levels. The answer sheet lists 4 levels: 1) S=0, L=1, J=1 2) S=1, L=1, J=1+1=2 3) S=1, L=1...

"primes" as Energy levels...(eigenvalues of a certain operator) I have heard about the Riemann Zeta function to be some kind of physical partition function..my question is..could we consider primes as "Energy levels" (eigenvalues) of a certain partition function or operator?..in the form that...

Finished A Levels! yay:biggrin: now i have to wait over a month to get results , hmm.(im sure like many of u) bit sad to leave skl tho :frown: i'll miss the place, friends, teachers, familiar faces. anyway wish me luck, I'm aiming for... A,A,A,A* and distinction(I wish(!) made a lot...

how can we directly demonstrate the existence of energy level within an atom??

The diagram shows some of the energy levels of an electron in a mercury atom. Level Q represents the lowest possible energy level. (a)Explain why a line spectrum results from an atom with such energy levels. (b) Calculate the energy change in joules when the electron moves from level...

For a 1D infinite well, The energy levels of an electron trapped inside is dependent on the length of the well. The longer the length, the less its energy will be for each state. I am aware how the formula is derived. The main form of the formula is a solution of Schrodinger's equation which...

ive done a test were, i get someone to try and distinguish to lines that are 0.25mm apart from varying distances. then I am going to do some kind of calculation to tell me somthing (hopefully) and i have done this experiement in different light levels, controlling the lux. and i have...

The question is: So I have the equation to find the energy in an infinite well… \[ \begin{array}{l} E_n = n^2 \frac{{\pi ^2 (\hbar c)^2 }}{{2mc^2 L^2 }} \\ L = 2*10^3 nm \\ m = 5.11*10^5 eV \\ \hbar c = 197.33eV*nm \\ \end{array} \] Using this, I find n=1 to equal...

Hi all, would someone tell me how to calculate work done? We did this ages ago in school, but I can't seem to remember how to do it. There was also other things, but all I can remember is something like force x mass divided by something... sorry. :blushing: If anyone has the faintest clue what I...

hi, I've just done an experinemt to try and show the resolution of the human eye in different light levels. i did it by putting a 0.25mm apart slits in a tube then, behind it had an adjustbable light, then i moved the slit further back, and asked them to say if they could see the two slits...

hi, i need help in understanding something on sound. if admam works near a jet plane that is taking off and experiences the sound level of 150dB. then the protectors to reduce the sould level to that of a chain saw, what decrease in dB is needed? i think it's 40 but i am not sure. and also if...

Can someone help me with the following questions (I have no idea where to begin in either case). There are no questions that follow these same types of concepts in the book problems. 1) A 6000 Hz tone must have what sound level to seem as loud as a 100 Hz tone that has a 50 dB sound...

Hi: a) an atoms electron is in the ground state (4.11*10^ -17). An electron with ke 5*10^-17 collides with the atom, what happens to the energy. b) What could subsequently happen to the electrons in the higher energy levels help please

If an atom has a ground state energy level of -10.4eV then why is the ionisation energy 10.4 x 1.6 x 10^-19J ? Wouldn't that amount of energy just cause the electron to move to the highest energy level? I would have thought that the energy required to ionise the atom would be any value greater...

I am currently in Cal AB and will hopefully study through Cal BC this year. I am raelly interested in Quantum Mechanics, Relativity, and String theory. I just wanted to know what level of math I will need to study Quantum, relativity, and string theory in depth. Like Diff Q's, Partial...

I didn't really know which thread to post this in... I am currently in Cal AB and will hopefully study through Cal BC this year. I am raelly interested in Quantum Mechanics, Relativity, and String theory. I just wanted to know what level of math I will need to study Quantum, relativity...

Let consider this small example...I find it interesting, but I think it does not in fact tell anything about reality : You are in presence of somebody, and another one enters the scene :Operation "times" : a) subjectively (as seen from you), the number of person is for you : x 2 : 1...

Hi Guys, Because of the absorbtion and emmision spectrum we know that atoms have quantised engergy levels. For example for an electron to jump from ground state to the first excited state in a Mecury atom, a photon with the exact energy of 4.9eV is required. Now my question is what would...

Hey guys I was wondering something probably very simple. Would I be able to determine the force something has been applying if I simply know its final kinetic energy and displacement? And I remember this one equation where something = Integral of F * dx. I swear I am forgetting everything...