- #1
yamata1
- 61
- 1
Homework Statement
Hello,
Here is a multiple choice question I would like to be clarified.
Suppose that the angular momentum of a system can take the values 0, 1, 2. One carries out a measurement of ##J_z##,the state of the system will:
##a##-Be perfectly known if the result is 0
##b##-Be perfectly known if we measure ##J^2##
##c##-Be perfectly known if no matter what the result is
##d##-will never be known
##e##-Be perfectly known if ,and only if the result is ##\mp2\hbar##
The Attempt at a Solution
After the answers I got in my previous thread https://www.physicsforums.com/threads/angular-momentum-state-of-a-system.933967/#post-5899253 I would say only ##b## is correct but I dislike the use of the term "perfectly" as we can't know ##J_x## and ##J_y##.
Thank you for your remarks.