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===== Spins Lab 4: Instructor's Guide =====
==== Main Ideas ====
  * Students investigate the effect of a uniform magnetic field on a spin system

==== Students' Task ====
To design experiments that investigate the effect of a uniform magnetic field on spin for both spin-1/2 and spin-1 particles.

==== Prerequisites ====
  * Spins Lab 2 & 3

==== Props/Equipment ====
  * Computers with the [[props:start#Spins OSP Software|Spins OSP software]]
  * A handout for each student

==== Activity: Introduction ====
==== Activity: Student Conversations ====
  * Students should design their own experiment to determine the effect of the magnetic field. Experiment 2 of Lab 2 should have given them some experience that will help them to do this. Rather than provide a method, ask the students to design and perform their own experiments. They should treat this as a puzzle to be cracked.
  * The magnetic field variable in the program is proportional to the spin precession angle $\omega_{0}t$, which is the Larmor frequency and the time of interaction. The Larmor frequency is proportional to the magnetic field strength. For Spin-1/2, the angle is $10^\circ$ times the shown value. For Spin-1, the angle is $5^\circ$ times the shown value.

==== Activity: Wrap-up ====

==== Extensions ====

This is a lab that is designed to be used in a 2 hour lab block.  For a shorter version of this same activity that can be used in the midst of lectures, see [[courses:activities:spact:spspinhalfbfield|Determining how a $\vec{B}$ Field Changes a Spin-$\frac{1}{2}$ Particle's State]].