# Introductory Quantum HW (Angular Momentum)

**1. The problem statement, all variables and given/known data**

Consider a three-dimensional system with wave function ψ. If ψ is in the l = 0 state, we already know that Lzψ=0. Show that Lxψ=0 and Lyψ=0 as well.

**2. Relevant equations**

[Lx,Ly]ψ = i*h-bar*Lzψ

**3. The attempt at a solution**

I’m having trouble figuring out where to start this. I think it should be clear and straight-forward, but for some reason I’m just not seeing how I can derive this. I tried using the above equation, to get

[Lx,Ly]ψ=0.

I assume from here I would prove that this is only true of Lxψ and Lyψ are 0. That is assuming, I’m on the right track.

http://ift.tt/1qPsDfU

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