9677 #41

student2008 · Post by **student2008** » Thu Oct 16, 2008 12:05 pm

I apologize if someone asked about it before, but I'd like to know if there's the typo in this problem in the official materials printed by ETS? Shouldn't the $3P_{3/2}$ be $2P_{3/2}$, since there's only one electron (and thus S=1/2, 2S+1=2)? Because, if there're TWO electrons, the official solution (A) is erroneous (the spin in the electric dipole transitions can't change).

Helio · Post by **Helio** » Thu Oct 16, 2008 2:14 pm

http://grephysics.net/ans/9677/41

they say it is a typo. in the exam i doubt you will hunt down the answer

student2008 · Post by **student2008** » Thu Oct 16, 2008 5:29 pm

Yeah, I agree with these guys. But what about the official version? Has ETS announced the typo?

Helio · Post by **Helio** » Thu Oct 16, 2008 9:07 pm

ETS makes no mistakes.... how dare you accuse the gods

Unnatural Log · Post by **Unnatural Log** » Thu Oct 16, 2008 9:54 pm

I've always wanted to see the mysterious 9677 problem 90...

tonyhongxp · Post by **tonyhongxp** » Thu Oct 16, 2008 10:09 pm

Unnatural Log wrote:I've always wanted to see the mysterious 9677 problem 90...

strongly agree

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