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====== Two Non-Interacting Systems ======




===== Prompt =====

** "How many eigenstates does the combined system have?" **



===== Context =====

This [[strategy:smallwhiteboard:|SWBQ]] introduces two non-interacting identical systems with $N$ eigenstates each, and asks students to determine whether the new system will be extensive or intensive.

Students answer $N$ or $2N$. Using spin 1 system, ask for what the eigenstates of two spin-1 particles are. Soon we realize that it's $N^{(2)}=N^2$, which means it's neither extensive nor intensive.




===== Wrap Up =====

{{swbq>eeswnointsys.ppt|Powerpoint slide}}
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{{swbq>eeswnointsys.pdf|PDF slide}}

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