1. P

    An atom moves in a region where potential energy varies: calculating the new velocity

    Alright guys, I'm new here and to physics. I'm self-teaching physical chemistry and am starting with basic physics so I'm stuck on this: Consider an atom of mass m moving along the x direction with an initial position x1 and initial speed v1. If the atom moves for a time interval Δt in a...
  2. L

    What do we know about an undisturbed atom?

    Hello, can I say:we know only facts about how atoms do react after or during a disturbance? We do not know what an undisturbed atom is!? The properties of an undisturbed atom are in general unknown. Can I conclude: an undisturbed atom can be something completely different compared to how...
  3. T

    Hydrogen atom (perturbation theory)

    For the simplest situation of hydrogen atom (no relativistic, spin-orbit interaction) we have a situation where proton is creating electric field equal to a point charge e. Then electron is affected by that potential fi0(r) and hydrogen atom hamiltonian radial part is H0 (see the attachment)...
  4. timemachine2

    Energy bands, or amount of electrons in shells that effects absortion in absortion, a

    Would every solid object be transparent invisible if the electron never got exited fr Would every solid object be transparent invisible if the electron never got exited from the ground state, or shell level 1.? If it were possible to stop a electrons from getting excited in atoms, from all...
  5. M

    Magnetic Field in an Atom

    How is magnetic field created in an atom according to quantum model? I mean, we are taught about the magnetic field by bohr's model which assumes that electron revolves around the nucleus in a circular path. But in reality it doesn't do so. So the field will keep changing its orientation. And it...
  6. L

    ion or neutral atom?

    An atom of 28_13 AI decays into stable nuclide 28_14 Si by emitiing a beta particle. What's 28_14 Si ? the ans given is positive ion? in my opinion, it should be a neutral atom... which is correct?
  7. L

    ionistaion energy of H atom and energy released

    for part a , the question want ionistaion energy ... why shouldnt it be H2 atom dissciate to become 2H+ ion? but the solution gives H+ + e- = H instead? for part c , shouldnt the loss of mass from 10.0kg of LiD= 0.002988x(10^6)x10= 29.88kg? then use E= mc^2 to proceed?
  8. topsquark

    hydrogen atom

    I think it's probably easier to use a momentum argument here. The electron coming from infinity loses some of its momentum (hence it also loses potential energy from the Work-Energy theorem) to the newly formed hydrogen atom. The excess momentum makes the whole system move as a form of recoil...
  9. H

    hydrogen atom

    When electron starting from infinity combines with proton to form hydrogen atom the energy liberated is half of the potential energy lost Where does the half of the energy goes ?according to quantum mechanics electron is not moving in discrete orbits hence it cannot be used as kinetic energy...
  10. B

    [SOLVED] Induced polarization in an atom

    Hello everybody. I've been having an issue with this question: A point charge q is situated a large distance r from a neutral atom of polarizability alpha. Find the force of attraction between them. When I worked it out I found the force to be [alpha*q^2]/[8*pi^2*epsilon^2*r^5], but I...
  11. W

    Rutherford-Bohr Model of the Atom

    Alpha particles of kinetic energy 6.0MeV are incident at a rate of 3.0x10^7 per second on a gold foil of thickness 3.0x10^-6m. A circular detector of diameter 1.0 cm is placed 12 cm from the foil at an angle of 30o with the direction of the incident alpha particles. At what rate does the...
  12. S

    can a hydrogen atom have an electron spin number in the 2p energy level?

    can someone please also give me more information on the fourth quantum number? I'm failing to understand wikipedia's description
  13. G

    Wavelength of raditation

    What wavelength of radiation will be emitted when an electron in an atom of gas reduces in energy by 1.635 x 1018 J? What type of radiation is this? Don't know what to do.... Help please!
  14. H

    atom & nuclei

    K40 isotope of potassium has a half life of 1.37 x 109 years & decays to an isotope of Argon which is stable. In a particular sample of moon rock, the ratio of K atoms to Ar atoms was found to be 1:7 . Estimate the age of the rock, assuming that originally there was no argon present 1. 4.11...
  15. H

    atom & nuclei

    the ground stste energy of H- atom is -13.6 eV. the energy needed to ionise H- atom from its second excited state is 1.51 eV 3.4 eV 13.6 eV 12.1 eV