Energy levels Definition and 267 Threads

  1. I

    If a system is made of 3 atoms with no degeneracy with energy levels

    if a system is made of 3 atoms with no degeneracy with energy levels of fro example 0, e, 2e would it be safe to say that the system only has three microstate or will it be 2^3 microstates. if it is 2^3 can you please explain why?
  2. P

    Atomic Energy Levels Homework: De Broglie Wavelength & Ionisation of Fe

    Homework Statement Couple of questions State the De Broglie Wavelength for electrons with an energy of 50eV and the following is a picture is a diagram of the energy levels in Fe: http://www.freeimagehosting.net/image.php?eeddf8b465.jpg What is the energy required to ionise Fe in in...
  3. B

    Hg vapor energy levels & Frank-Hertz experiment

    [FONT="Book Antiqua"] All who are familiar with this famous experiment, know that multiples of 4.9 Volts are used, which is associated with the difference between the ground state and one that belong to the next level. The question is it related to this transition (only ?), rather than also to...
  4. H

    Calculating Wavelengths & Energy Levels of Hydrogen Atom

    Homework Statement the wavelengths of the emission lines produced by the hydrogen atom are given by the formula: 1/lambda = 1.096776 x 10^-2 ((1/n2^2) - (1/n1^2)) nm^-1 (a) what are the wavelengths of the first two lines in the Balmer series, H-alpha and H-beta (involving transitions...
  5. C

    Hydrogen-like ions energy levels

    Homework Statement An absorption line at 6966 eV is known to come from a hydrogen-like ion. Calculate the likely atomic number of the element and hence identify it. (The ionization energy of hydrogen is 13.6eV.) Homework Equations not sure The Attempt at a Solution Using...
  6. B

    Maximizing Energy Levels: Calculating Electron Transitions and Photon Momentum

    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...
  7. G

    Superposition/electron energy levels

    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.
  8. W

    Energy levels and the Aufbau Principle

    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...
  9. E

    Anomoly in calculations/standard value for electron energy levels

    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...
  10. Jeebus

    Atomic Energy Levels: Calculating Hydrogen's 5 Lowest Levels

    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...
  11. E

    Solving the Vertical Plane Pendulum: Energy Levels & Corrections

    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...
  12. L

    Question about electrons, energy levels and orbits

    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...
  13. Q

    Calculating Lowest Energy Levels of a Rigid Spherical/Cubic Box

    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...
  14. G

    Solving Energy Levels of 2-Spin 1/2 System

    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...
  15. G

    Energy levels of helium/equation

    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...
  16. S

    What Causes Quantum Energy Level Degeneracy?

    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...
  17. R

    Atom Energy Levels & Absorption of Photons

    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...
  18. Q

    Harmonic Oscillator- Energy levels

    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=...
  19. M

    What are the variables in determining energy levels for a finite potential well?

    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...
  20. Z

    Entropy, energy levels and harmonic oscillation.

    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...
  21. S

    Energy levels in finite 1d well

    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
  22. X

    Energy levels of electrons excited by photons

    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...
  23. N

    Why Do Free Electron Energy Levels Appear as Multiple Parabolas?

    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...
  24. P

    Energy levels in a potential well

    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
  25. B

    Energy levels from the Schrodinger eqn

    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...
  26. M

    Experiment on Atoms: Determining Energy Levels

    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...
  27. N

    Understanding Quantum Energy Levels in Bohr's Model of the Atom

    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...
  28. D

    What is the relationship between energy levels and de Broglie waves?

    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...
  29. A

    Understanding Line Spectra: Evidence of Atomic Energy Levels

    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:
  30. C

    The Boltzmann distribution of uniformly spaced energy levels

    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...
  31. T

    How Do Energy Levels Interact When They Are Quantized?

    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...
  32. S

    Energy levels in quantum well structures

    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...
  33. S

    Energy levels in quantum well structures

    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)...
  34. N

    Electron Configuration and energy levels

    -------------------------------------------------------------------------------- 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...
  35. S

    Identical particles and degenrate energy levels

    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...
  36. N

    Determine the energy levels, their degeneracy and wave functions of a particle

    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...
  37. C

    How make a confront between energy levels?

    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...
  38. P

    Understanding Muonium Energy Levels and Relativistic Velocities

    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?
  39. P

    Hydrogen energy levels (quantum theory)

    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...
  40. G

    Kinetic Energy and Radiant Energy levels

    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...
  41. J

    Line spectrum and energy levels

    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?
  42. C

    Energy levels for the Hydrogen Atom

    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...
  43. E

    Energy levels of partciles in a 3D box

    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...
  44. C

    Emission & Energy levels of Hydrogen Problem

    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/...
  45. W

    Reflection and Quantization of Energy Levels

    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...
  46. H

    Bohr Energy Levels: Explaining the Concept & Equations

    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.
  47. A

    How Should I Calculate Rotational Energy Levels of NH3?

    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...
  48. B

    How Do Quantum Numbers Relate to Electron Configurations?

    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)...
  49. Clausius2

    Rotation Energy Levels and Degeneracy.

    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...
  50. A

    Photoelectric effect and energy levels in atoms

    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...
Back
Top