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=====Spin Precession (5 minutes)=====
{{courses:lecture:splec:splamorprecession.ppt|}} (Slide 4)

  * This lecture is best performed following the [[..:..:lecture:splec:splecehrenfest|Ehrenfest's Theorem]] lecture.
  * Slide 4 shows the expectation value of the general spin operator $\vec{S}$ spinning about the x-y plane with a constant magnitude in the z-direction (as long as $\theta$ is constant).  This rotation of the expectation value is called "Lamor Precession" and the frequency at which the expectation value rotates is called the "Lamor Frequency."
  * Note that this rotation is a direct consequence of the fact that the direction in which the particle is spin-up is changing with time.


//**Providing the slides in a handout form is often beneficial for students so they can discuss and review the calculations at a later time and at their own pace.**//

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