9677 #77

student2008
Posts: 4
Joined: Thu Oct 16, 2008 11:55 am

9677 #77

Postby student2008 » Fri Oct 17, 2008 9:38 am

excuse me, but
WHAT THE F* choises (B) & (D) coincide????

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Helio
Posts: 809
Joined: Thu Mar 15, 2007 7:11 pm

Re: 9677 #77

Postby Helio » Fri Oct 17, 2008 1:58 pm

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

student2008
Posts: 4
Joined: Thu Oct 16, 2008 11:55 am

Re: 9677 #77

Postby student2008 » Sun Oct 19, 2008 10:43 am

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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