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: Spin

Friday, October 10, 2008
Asked by: Sree
Subject: Physics
Question: Actually what is spin? How it is consider as 1/2 , 1 etc.
What is its physical significance .
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posted by S @ 10:51 PM  
  • At December 1, 2008 at 11:23 PM, Anonymous Anonymous said…

    spin is an intrinsic property like mass or charge .Intrinsic
    properties can be measured or experienced , its origion is
    mysterious . why an electron has got a mass or charge.these questions
    are still unanswerable.same is the case with spin .spin has nothing to
    do with spin about an axis .It is purely a quantum effect .But it
    produces same effect as when a body spins about its own axis ie spin
    angular momentum . Spin of the electron is selected to 1/2 to match
    with experimental observations like stern gerlach experiment. But it
    can be theoretically prooved using relativistic quantum mechanics.
    spin is related with the symmetry of the wavefunction. its physical
    significance is evident from magnetic effects.

  • At December 1, 2008 at 11:26 PM, Anonymous Anonymous said…

    spin is the intrinsic property of the elementary particle, or material or an object.
    it arises due to the quantum numbers.
    quantum NUMBERS occurs due to the schrodinger s wave eqation naturally

  • At December 1, 2008 at 11:52 PM, Anonymous Anonymous said…

    The astronomical analogy is the earth revolving around the sun in one year but simultaneously turning around its own axis within one day. The total angular momentum of the earth is the orbital angular momentum plus the "spin" of the earth. Similarly, the electron of the hydrogen atom has for
    l > 0 an
    orbital angular momentum l = rx p and in addition its spin s
    Einstein–de Haas Effect
    Einstein proposed the following experiment in order to gain insight into the causes of magnetic properties of solids.
    It was actually performed some years later by the Dutch physicist
    Wander Johannes de Haas (1878–1960).
    An iron cylinder with mass m and radius R hangs on a thin wire in a vertical magnetic field
    B = {0, 0, B
    z}, produced by an electric current through a coil.
    The magnetic field was chosen sufficiently strong to saturate the magnetization

    = of the cylinder with N free electrons, each possessing the magnetic moment µ.
    In cases of saturation, all magnetic moments point in one direction opposite to that of the magnetic field. Since the free electrons in the conduction band of iron have no orbital angular momentum and therefore also no orbital magnetic moment (there is no force center to cause a circular motion of the electrons) the magnetic moment must have another reason. We will see that it is caused by the spins of the free electrons.


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