Which is true? A)The spin angular momentum vector itself can be measured, and it

Question

Which is true?

A)The spin angular momentum vector itself can be measured, and it can be aligned along the measurement axis (z axis).

B)The spin angular momentum vector itself cannot be measured, but its component along the measurement axis (z axis) can be measured.

C)The spin angular momentum vector itself can be measured, and its component along the measurement axis (z axis) can also be measured.

D)The spin angular momentum vector itself cannot be measured, but it can be aligned along the measurement axis (z axis).

Explanation / Answer

the angular momentum cannot point completely along a given axis z is that the other two components will always have a nonzero uncertainty, which is forced upon them by the commutation relations. This uncertainty, in turn, makes the xx and uncertainty y components have nonzero expected magnitude, and this makes the angular momentum vector point slightly off-axis. Option c true

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