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9677 #77

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student2008

Post subject: 9677 #77

Posted: Fri Oct 17, 2008 9:38 am

Joined: Thu Oct 16, 2008 11:55 am

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Joined: Thu Oct 16, 2008 11:55 am
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excuse me, but
WHAT THE F* choises (B) & (D) coincide????

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Helio

Post subject: Re: 9677 #77

Posted: Fri Oct 17, 2008 1:58 pm

Joined: Thu Mar 15, 2007 7:11 pm

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S1 = S1x + S1y + S1z
S1 = S2x + S2y + S2z

Those two can't coincide... go back to your QM to the chapter about spin addition

BTW this question has to do with math more than physik

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student2008

Post subject: Re: 9677 #77

Posted: Sun Oct 19, 2008 10:43 am

Joined: Thu Oct 16, 2008 11:55 am

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Joined: Thu Oct 16, 2008 11:55 am
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Nope, I'm not wrong. Just simplify the expression (D) to obtain (B)!
Moreover, the operator (J1+J2)^2 may have common eigenfunctions with J1^2 & J2^2 only in the ground state, that's why (B)=(D)!

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