剛剛看到一個題目的解答
可是我不了解它的物理意義
所以想請教各位版大~

題目:
A beam of spin-1 particles , moving along the y axis, is incident
on two collinear SG apparatues, the first with B along the z axis
and the second with B along the z' axis, which lies in the x-z plane
at an angle W relative to the z axis. Both apparatuses transmit
only the uppermost beams. What fraction leaving the first will pass
the second?

解答:
   Jy
 -i--- W
    h(霸)
e         |1 , 1> = ..................................

(1)我想請問這個Jy是什麼意思呢?
(2)我想請問|1 , 1>是什麼意思?
(3)這個運算式要表達的是什麼?

啊...對不起我真像個白痴
不過還請各位高手海涵賜教
不勝感謝呀^^"




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