Levels Definition and 471 Threads

1. The diagram above shows the lowest four descrete energy levels of an atom. An electron in the n=4 state makes a transition to the n=2 state, emitting a photon of wavelength 121.9 nm (a)Calculate the energy level of the n=4 state. (b)Calbulate the momentum of the photon. The photon is then...

when an electron in an atom transitions from one shell to another does it do it instantly or is there a time when it is partially in one and partially in the other. in other words in a superposition of both states.

The energy levels of the hydrogen atom are given by En=-me4/(32\pi2\epsilonohbarn2, and are independant of the orbital angular momentum quantum number l, yet the Aufbau principle clealry implies that the energies of s, p, and d orbitals are different. Explain this apparent paradox and provide...

The energy levels of an atom are found by En=-13.6(Z/n)^2. Using this equation for xenon's ionization energy (Z=54) gets E=-39657.6eV. However in the Modern Physics ed3 textbook by Serway/Moses/Moyer on pg232 it has the ionization energy for xenon to be 12.127eV. Does anyone know what's...

Homework Statement Calculate the five (5) lowest energy levels for the hydrogen atom using Bohr's model. Homework Equations [tex]E_{n}= -2\xime^4 Z^2/h^2 n^2[\tex] = [tex]-(2.178\times10^18 J)Z^2/n^2[\tex] The Attempt at a Solution I get how to attempt it but how can there be...

There are a wealth of resources... videos, texts, libraries, etc. that are available to us in our studies in physics. Even Physics Forums sections devoted to compiling lists of such resources! For the sake of pacing, discipline, and other reasons (guidance?), who else would be interested in...

Homework Statement a mass m is attached by a massless rod of length l to a pivot , which allows swing freely in a vertical plane under the influence of gravity .let the anglethita betweenthe rod the vertical . find the energy levels of the system? find the lowest -order correction to the...

I want to start taking math one day a week to get the credits done and I'm wondering what the Mathematical ladder is relative to the level of difficulty?

To make my question clear, i'll talk about the hydrogen atom. The energy of the electron level is -13.6 eV / n^2. This means that the higher the orbit (n), the higher the energy. Still, I've always read that K-shell (n=1) electrons are strongest bound. Yet when an electron goes from a high...

Homework Statement Determine the four lowest energy levels, their degeneracies and quantum numbers of the wavefunctions for an electron in i) a rigid spherical box of 2 Angstrom radius and, ii) a rigid cubic box of the same volume Express the result in multiples of ħ2/(2m0a2), and...

Homework Statement Find the energy levels of a 2-spin 1/2 system with spinoperators S1 and S2 in an external magnetic field. The hamiltonian is of the form, H= A ( 1-\frac{2S_{1}}{h} . \frac{2 S_{2}}{h} )+ \frac{\mu B}{h}(S_{1,z}+S_{2,z}) The h is a h-bar, constants A, B, and S1 and S2 the...

the equation for the energy levels of a hydrogen-like atom is: Note that aμ, is approximately equal to a0, (the Bohr radius). If the mass of the nucleus is infinite then μ = me, and aμ = a0 but what is the equation for the energy levels of a helium or helium-like atom? I've heard...

Hello!Happy New Year! I am currently working on the thermal dependence of photoluminescence measurements of Zinc oxide. however, I am investigating numerically. At thermal equilibrium the generation of carriers is equal to the recombination rate, away from thermal equilibrium- away from the...

(UK) What are the GCSE levels requirements to apply for MIT? For UK guys only... What are the GCSE levels requirements to apply for MIT? for those who wants to anser..heres the GCSE leveling here in UK A* A B C D E F G U How many As do you think I'd need for GCSE? Dyou...

Are O2 levels dropping in our atmosphere? I read something a while ago that mentioned allergies are getting worse due to increasing CO2 levels in atmosphere, so I'm guessing O2 levels are dropping as well. I was in the mountains a week ago (out of a valley), and noticed how easier it is to...

I'm not going to follow the form because this is more of a hand-wavy question, I don't need it for a specific homework question but it's confusing me, I hope it's still okay to post here. I understand the splitting of energy levels due to j (dependant on l and s) and I understand that each of...

Does anyone have a source of the actual (today) dose rate levels in the 30 km zone near Chernobyl ?

If so, wasn't it confirmed when we saw an increase in ice levels at the poles this year?

http://www.tgdaily.com/html_tmp/content-view-39973-113.html Also notice the stubborn misunderstanding: Run http://geosci.uchicago.edu/~archer/cgimodels/radiation.html with the basic inputs to get an output radiation of 287.844 W/m2. Now put zero in the CO2 box to get 318.396 W/m2, then...

Homework Statement Say that an atom has the following energy levels: E1 = -9.20 eV E2 = -6.20 eV E3 = -3.70 eV E4 = -2.40 eV E5 = -1.60 eV Suppose atoms in the E2 level are exposed to incident radiation of wavelength 413.3 nm. Would this radiation be absorbed by atoms in the E2 level...

I can't do this problem at all, can anyone help? Thanks. During a trip to Roswell, New Mexico, you find yourself at a cocktail party with aliens from another universe. You are at a loss for conversation so you offer to reconstruct the periodic table from memory (chemistry being the most...

Homework Statement Predict the wavenumber (cm-1) position of infrared absorption due to fundamental vibration from v=0 to v=1 and 2nd overtone from v=0 to v=3. For a harmonic occilator whose frequency=8.00x1013 s. Homework Equations Energy expression for harmonic oscilator: Ev=...

Take a look at these three scenarios: 2 We do not know how to build a fusion reactor. 2. We know how to build a fusion reactor, but we haven’t built one yet. 3. We have built a fusion reactor. Does the three alternatives describe different stages of technological development? Or is two...

Hi, I am trying to show that the energy levels for a finite potential well can be determined from these two equations\gamma = kcot(-ka/2) for B=0 and \gamma =-ktan(-ka/2) for A=0. I think it has something to do with substituting in the value of k, but I'm not quite sure where to start...any...

Homework Statement A model to describe the vibrations of atoms in a solid is to assume that the atoms are isotropic harmonic oscillators and that the vibrations are independent of the vibrations of the other atoms. We use this model to describe the entropy and heat capacity of Bohrium (B). The...

could anyone suggest the methods for solving the energy eigenvalues in a 1d finite potential well. are there any websites where we can directly get these instead of writing programs for rootfinding

When the depth of a quantum well increases, the first level increases or decreases its energy with respect of the bottom of the quantum well?

Hi there! Does anyone here know what the typical light levels are at the Martian surface (in daylight hours!) and how they vary in magnitude through time? I'd prefer a measurement close to the equator, but I'd be happy with one from anywhere at the surface. I can easily calculate the...

Six days ago, the Dutch government added a flight fee at Schiphol, the Amsterdam airport, to be used to lower Earth’s atmospheric carbon dioxide (CO2) levels. The Netherlands is one of the four countries that tax carbon put into air in response to advice from the UN-sponsored Intergovernmental...

I've been researching the change of energy levels of electrons when excited by photons. The equations I have found are... E_n = (-2pi^2 * m * e^4 * Z^2)/(n^2 * h^2) Which gives us the energy of the electron at a particular energy level. m = mass of electron e = electric charge of...

In many textbooks and sites of solid state physics energy levels for the free electron approximation in band calculations are displayed. The result is a collection of many parabolas, each of these parabolas being centered on a site of the reciprocal lattice. This is not anyway the picture that...

I know this question seems very simple which is why its bugging me so much: Why is the ground state energy not zero? A simple answer would be greatly appreciated

I have had a pressing question haunting my mind for quite some time, and I need an expert opinion. My car calls for premium fuel (2007 Honda Civic Si), yet states (in the owners manual) not to use gas below the octane level 87. Now I purchase my gas from Sinclair and the octane levels read...

Homework Statement I'm just wondering how you get the energy levels from the Schrodinger equation. I've got the equation in the form H(psi) = E(psi) with all the H expanded out, I just don't know how to calculate the energy levels from it. Its probably something I did once know how to do, but...

Homework Statement An experiment is performed on a sample of atoms known to have a ground state of -5.0eV. The gas is illuminated with "white light" (400-700 nm). A spectrometer capable of analyzing radiation in this range is used to measure the radiation. The sample is observed to absorb...

This was prompted by another thread which got me thinking. If CO2 levels are increasing then surely O2 levels must be decreasing? I mean I am just going by basic chemistry, we have hydrocarbons (fossil fuels) where are being burnt and I believe the basic formula is:- Hydrogen and...

I've googled quite a bit. Other than finding articles that require payment to view I have found nothing usable. I need a source - possibly a table would be best - of estimated oxygen levels since the Cambrian. Thanks. - Reason: the only text I have was out of print during the Eocene...

Hello people ! As a CIO, you have been supporting the computing and network services of business applications from 2 centers I and II. Suppose either center is capable of providing all of the service needs, that S1, S2>=0 is the level (quantity) of services delivered from each center and...

hello i have a basic question regarding energy levels of electrons in atoms in bohr's model of the atom. From what I understand if an electron is in an energy level other than the ground state it can either absorb a photon equal to the difference of energy between its energy level and a higher...

The Formula for computing E(n) = -(Z^2)/(n^2) * Ei is fairly straight forward. Am I right in thinking this formula refers to the energy level of the atom with Z number of protons? This formula, what it yields at least, doesn't depend on the number of electrons the atom has? Also, when...

Hello, can someone explain how a line spectrum works. How do they provide evidence of energy levels in atoms? I would have thought that energy levels are to do with a different concept of Bands (Valence, Conduction) so how does a line spectrum provide evidence? :confused:

The question states: A system has energy levels uniformly spaced at 3.2x10^-10 J apart. Thepopulations of the energy levels are given by the Boltzmann distribution. What fraction of particles is in the ground state at T=300K. I know that the Boltzmann distribution is: _{}p*j=probability...

1. Are rare Earth magnets harmful to handle and if so what strengths and sizes are safer? 2. Is the magnetic field produced by an electric car strong enough to have harmful effects on a person s health.

Pretty basic question: If energy levels (say, of an electron) are quantized, how is an interaction resolved wherein incoming energy (say, a photon) is not of an appropriate amount of energy to result in an appropriate response (say, moving from 1s to 2s in a simple hydrogen atom)? Suppose the...

Can levels of a protein like NFKappa be lowered to be the same as a younger person's levels? (I mean can either the body be made so that it makes a lower protein level or can the level of protein be reduced after it's been made) I mean because for example people can lower white blood cell...

Does anyone knows how to solve the following eigenvalue equation using matlab? so as to obtain the energy levels in a quantum well structure.. or does anyone has the codes or knows where to find the codes to do so? Eigenvalue equation: tan(sq_root(2mE/hbar^2)*(d/2)) = sq_root((V-E)/E) for...

Does anyone knows how to solve the following eigenvalue equation using matlab? so as to obtain the energy levels in a quantum well structure.. or does anyone has the codes or knows where to find the codes to do so? Eigenvalue equation: tan(sq_root(2mE/hbar^2)*(d/2)) = sq_root((V-E)/E)...

-------------------------------------------------------------------------------- 1. Homework Statement The electrons of a nelectronically-excited neutral magnesium atom have the coniguration 1s^2 2s^2 2p^6 3p 3d. Provide spec notation for the possible quant states of the atom as a whole...

Homework Statement Five electrons (with mass m) whose interaction can be neglected, are in the same 3-dim harmonic oscillatorpotential V(x,y,z) = \frac k2 (x^2 + y^2 + z^2) What is the ground state energy? Homework Equations The Attempt at a Solution I have the energy for the...

I understand that for a semiconductor p-n junction under zero voltage, the Fermi level is constant throughout the junction because that is the condition for a system in thermodynamic equilibrium. I also understand that p-n junction under applied voltage (forward or reverse) is not a system in...