(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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<Jx>=<Jy>=0

2. Relevant equations

Jx=1/2(J++J-)

Jy=1/2(J+-J-)

3. The attempt at a solution

<jm l Jx l jm> = < jm l 1/2 J+ l jm> + < jm l j- l jm >

= < jm l h/2 sqrt [(j-m)(j+m+1)] + h/2sqrt[(j+m)(j+m+1) l jm >

i am not sure how to apply the next step

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# Expectation value of X and Y component of angular momentum

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