- #1
JBrandonS
- 21
- 0
Hello,
I am currently teaching myself quantum mechanics using MIT's OCW and am suck on the following problem from the second problem set of the 2005 7.43 class.
Consider an operator O that depends on a parameter λ and consider the λ-dependent eigenvalue equation:
[tex]O(λ)| \psi(λ) > = o(λ) | \psi(λ) >[/tex]
Show that one can compute [itex]\frac{do(λ)}{dλ}[/itex] without knowing [itex]\frac{d|\psi(λ)>}{dλ}[/itex]. Thus one can determine the change in the eigenvalue without knowing the change in the eigenstate.
Under what conditions would O(λ) commute with O(λ')
I really have no idea where to begin on this one.
I am currently teaching myself quantum mechanics using MIT's OCW and am suck on the following problem from the second problem set of the 2005 7.43 class.
Homework Statement
Consider an operator O that depends on a parameter λ and consider the λ-dependent eigenvalue equation:
[tex]O(λ)| \psi(λ) > = o(λ) | \psi(λ) >[/tex]
Show that one can compute [itex]\frac{do(λ)}{dλ}[/itex] without knowing [itex]\frac{d|\psi(λ)>}{dλ}[/itex]. Thus one can determine the change in the eigenvalue without knowing the change in the eigenstate.
Under what conditions would O(λ) commute with O(λ')
Homework Equations
The Attempt at a Solution
I really have no idea where to begin on this one.