Levels Definition and 471 Threads

Homework Statement In Bohr's model the allowed paths are those which the angular momentum is quantized by L=ħn and the electromagnetic radiation emission is only by transition through two of them ν=(Ei-Ef)/h. I am asked to use the above assumptions to calculate the energy levels and the...

Homework Statement A system has non-degenerate energy levels with energy \epsilon=(n+1/2)\hbar\omega where h-bar*omega=1.4*10^-23J and n positive integer zero what is the probability that it is in n=1 state with a heat bath of temperature 1K Homework Equations Z=\exp^\frac{-E_i}{k_b T} \\...

Homework Statement The figure shows a schematic drawing of an open ended well-type manometer. Attached to one end of the manometer tube is a well (a reservoir with a higher crossectional area compared to that of the tube). The manometer is filled with a fluid with an SG = 2.95. The manometer...

Homework Statement For a nitrogen molecule, calculate the lowest 2 energy levels and the characteristic temperature; Mass of molecule = 2.33x10-26[kg] Length of box = 10-9[m]Homework Equations E = n2.h2/8mL2 (n=1,2,3,...) Characteristic Temperature (Tc) -> when thermal energy kBT =...

Homework Statement Use the Bohr quantization rules to calculate the energy levels for a particle moving in a potential \begin{equation} V\left(r\right)= V_0 \left(\frac{r}{a}\right)^k \end{equation} where k is positive and very large. Sketch the form of the potential (done) and show that the...

Homework Statement A system has three energy levels, E1=0, E2 =1 and E3 = 2. In a certain state of the system, the probability that energy level 1 is occupied is 0.1, that energy level 2 is occupied is 0.8, and that energy level 3 is occupied is 0.1. Is this an equilibrium or a non-equilibrium...

If 4s orbital is in the 4th shell and 3d is in the 3rd shell and if the Principal Quantum Number is the direct indication of the amount of energy in of the electrons in that shell. Then, why according to Aufbau principle is 4s filled before 3d?

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Hello Forum, I am confused about the concept of rotational energy levels, electronic energy levels, and vibrational levels. A graph of "Energy versus Distance" is usually presented and the various horizontal bars represent the energy levels, which are simply energy amounts. The energy of...

Hi. Is there a Hilbert Space for each energy level of a system? (And, in general, for every point in time?) I read in some book that if a equation for a problem accepts two different sets of wavefunction solutions (the case in question was the free particle and the sets of solutions in...

Hi all, I think I understand the concept of doping a group IV semiconductor material with a group V atom which has one extra valence electron to "donate" to the conduction band, or doping with a group III atom with one too few electrons which will "accept" an electron from the lattice and...

Suppose we have an interface between a semiconductor and a liquid electrolyte that contains a redox couple whose redox level is ER. Let Ecs be the edge of the semiconductor conduction band at the interface. Is Ecs-ER constant independent of the doping level in the semiconductor? The papers I...

What is the fundamental reason why the allowed energies of electrons are quantized? I did some research on the web before posting this and what I found seems to link this to the wave-like behaviour of electrons. That is, if electrons could hypothetically exist within the band gaps of the atom...

A recent study of eighteen rhesus monkeys provides clues as to the effects of birth order on an individual's levels of stimulation. Could someone please explain the bold part?

A new type of energy storage described which uses quantum way to store energy. ''Battenice''. http://techon.nikkeibp.co.jp/english/NEWS_EN/20140224/335902/ How exactly new energy levels could form under UV light? What do the mean?

Homework Statement Question 1) For absorption transitions: At n=1 the energy is 0.0eV (electron volts), at n=2 the energy is 3eV, at n=3=5eV Question 2) For emission transisions: At n=1 the energy is 0.0eV, n=2 energy is 3eV and at n=3 energy is 5eV Question 3) The atom has energy...

So I have a pair of headsets, turtle beaches, that require a usb power for the amplifier. Now I thought the amplifier was just to combine the two outputs of game audio and chat audio, but do headsets like turtle beaches need a more powerful signal than just headphone level. I ask this because I...

Homework Statement Imagine a box of unknown length with the only visible photons emitted have 620nm and 443nm. Identify the transitions and find the length of the box. Homework Equations wavelength = (8mc2L2)/(hc(ni2 - nf2) The Attempt at a Solution So I assume that I need to do is...

Homework Statement In the spectrum depicted bellow (see added picture) are spectral lines which resulted from emissions of a photon due to an electron decaying from a higher to a lower orbital in a Hydrogen-like atom (meaning- only one electron. No details about the nucleus) All lines in the...

Hello, I have a question regarding discrete energy levels of atoms. If electrons must inhabit certain energy levels, when they are excited up to a higher energy level, do they instantaneously jump to that level, or do they exist for some short time 'in between'? Furthermore, if the...

I understand that a photon can be 'absorbed' by an electron resulting in the electron jumping to a higher energy level within an atom. I also understand that a photon is emitted when an electron jumps to a lower energy level within an atom. But why does the electron jump to a lower energy...

If an electron gets excited from K to L shell, it will actually finish in the 2p subshell and then deexcite to 2s and 1s at the end, right?

Relevant formula : p(out) / p (in) x 100 percent = efficiency My question My approach But the right answer is 650kW

Homework Statement At the bottom of this linked-to screen below is an equation for E = - ... = - .... = - 13.6 Z^2 / n^2 eV https://en.wikipedia.org/wiki/Bohr_model#Electron_energy_levelsHomework Equations I'm using the following values for the formula Z=1 n=1 K sub e = 8.987 x 10^9...

I'm on my second year in college and I'm doing a lecture on Fermi levels. The descriptions on Wikipedia and other sites don't seem to have been made for my level of knowledge, as I have difficulty understanding it. How would you describe Fermi levels on an entry level?

FYI, I'm not very knowledgeable in this topic however I have noticed something intriguing whenever dealing with sound levels and feedback. My question is.. Why is it that if I were to say turn my headphones to 100% volume and my PC volume is 50% the sound will sound a little "distorted or fuzzy"...

There's been a lot of headlines in sports lately about record breaking noise levels. The Seattle Seahawks home stadium broke the outdoor stadium noise record at 137.6dB (the previous record is from an outdoor stadium as well). The indoor stadium noise record is 126 dB at the Sacramento Kings...

Homework Statement A hydrogen atom is in 2p state, how many different energy levels are there if a magnetic field of 0.10 T is applied to it, and what are their energies? Make sure spin is included. Homework Equations U = -gmsμzB g is the Lande-g factor, which is about -2 for...

This question is based on a modern physics lab I'm working on, and it's conceptually killing me. 1. Homework Statement For hydrogen, compare your measured wavelengths to the predicted wavelengths for hydrogen. Assuming the lower level is the same for all the lines you observed in the...

A common example of this is that when bringing N hydrogen atoms together into a ring. Far apart, assume each electron exists in the 1s state. As we bring them together, instead of each electron staying at the original 1s level, or all of them changing by the same amount, the 1s level fans out...

I'm new to laser technology and learning it from some lecture videos and a textbook "Optics & Lasers". When I came to the light amplifier part, I got stuck in understanding the difference between "rapid decay" and "metastable state" -- what I can recite now is that "rapid decay" cannot...

Hi, I'm Adrian, a British student at college (US = senior high school year I think) studying Advanced Levels in maths, further maths, physics, chemistry and economics. I plan to go on to do Physics BSc at university hoping for either Oxford or Durham universities (depending on my grades this...

I can not get convinced why for energy level, filled with an even number of electrons, the net magnetic moment is zero! If we have a level with the quantum number l, we have two electrons with opposite spins in it. Also magnetic moment is proportional to Jtotal where J_t= J_1+J_2(1and 2 refer...

Hello everyone, I will be an incoming freshman next academic year at my local uni. I've been looking at and talking about majors with my friends and family and many mentioned that computer science was a very in demand, practical, and lucrative field (well, relatively lucrative, lol...

Homework Statement Okay, this one confuses me a bit: A particle is in a one-dimensional harmonic oscillator. At time t = 0 is given by its wave function ψ(x)=Nx3exp(-mωx2/2hbarred) a) At this point you measure the particle's energy. What measurement values ​​are available? Also...

Im wondering if all matter have discrete energy levels because electron and nuclei have discrete energy level. my thought is that as mass increases the separation of the energy levels decease, so because mass is so large at our scale the separation of energy levels is so infinitely small and see...

The problem: Find the relative numbers of hydrogen atoms in the chromosphere (T=5000 K) in the n=1, 2, 3, and 4 energy levels. Solution: The Boltzmann distribution of energies is n(ε)dε=\frac{2πN}{(πkT)^{3/2}}\sqrt{ε}e^{-ε/kT}dε So using this I calculated the ratio to be, 1 : 5.4 x 10^-11...

Hi, I'm leylamew. So, I'm in the Cambridge University O Level board and I'm studying for my examinations, which will be in May. I'm taking the Math 4024 paper. I was solving the past paper for 2010 and I hit a roadblock. (Shake) Here's the link...

Hello, I currently have a bachelor in IT (evenig classes). I live in Belgium and the only grades I know are Bachelor/Master/PhD. Maybe I would like to find evening classes in physics, even if it's in another country (very hypothetical for now). I'm currently looking for infos about the...

Why do electrons closer to nucleus have Less energy than electrons first away? Thanks

Homework Statement Find the energies of the second, third, fourth, and fifth levels for the three-dimensional cubical box. Which are degenerate? Homework Equations E = h^2/8mL^2 (n^2 sub x + n^2 sub y + n^2 sub z) The Attempt at a Solution The levels would be degenerate if one of...

I'm trying to find the energies for n levels of a 3D cubical box. Is there a general equation for this?

Regarding the relation between atoms' kinetic energy and the energy levels of their electrons upon excitation: In other words, what really happens when an atom is excited, either by radiation or by collisions, or otherwise ? What are the mechanisms under which the transferred energy goes to...

I'm currently working on a paper dealing with aspects of Franck-Hertz experiment, and encountered some puzzling descriptions and symbols in an article published in the past, as follows: 1. The article includes a simplified energy level scheme of mercury. This scheme includes also 7th & 8th...

I saw somewhere that mathematics can be divided into 10 sections, i quote: "1-Arithmetic 2-Basic Logic and Set Theory: proof techniques and reasoning, Sets, operations on sets, mappings, binary relations (you'll need that if you expect to go anywhere beyond arithmetic..)...

We're just been learning about emission and absorption spectra and how these relate to the energy levels of electrons in an atom but its brought up 2 questions. 1. In chemistry our notes say that the energy change between levels gets smaller as you move out from the nucleus, however in...

Is there research or data that measures the penetration of various visible light colors on the human body?

Is the ground state always most probable state of the system? For example in problem of LHO or potential well?

Homework Statement Calculate the wavelength of the electromagnetic radiation emitted when an electron makes a transition from the third energy level, E3, to the lowest energy level, E1. Homework Equations E_n = \frac{\left (n_{x}^{2}+n_{y}^{2}+n_{z}^{2} \right) \pi^{2}...

Using the NIST database, I get the following energy levels for Ne^9. But there some some values missing (where the ? is shown). Any of you know these numbers, or where I can find them? Thanks. 1s2 1S 0 0.00000 1s2s 3S 1 7299940.0 1s2p 3P° 1 7379327.8 1s2s 1S 0 7382680.0...