- #1
Zero1010
- 40
- 2
- Homework Statement
- Quick question about using the generalised Ehrenfest Theorem.
- Relevant Equations
- $$\frac {d<A>} {dt} = \frac{1}{i\hbar}<[\hat A,\hat H]>$$
Hi,
I have a question which asks me to use the generalised Ehrenfest Theorem to find expressions for
##\frac {d<Sx>} {dt}## and ##\frac {d<Sy>} {dt}## - I have worked out <Sx> and <Sy> earlier in the question.
Since the generalised Ehrenfest Theorem takes the form:
$$\frac {d<A>} {dt} = \frac{1}{i\hbar}<[\hat A,\hat H]>$$
Does this mean I also have to find the expectation value of the Hamiltonian operator?
Thanks
I have a question which asks me to use the generalised Ehrenfest Theorem to find expressions for
##\frac {d<Sx>} {dt}## and ##\frac {d<Sy>} {dt}## - I have worked out <Sx> and <Sy> earlier in the question.
Since the generalised Ehrenfest Theorem takes the form:
$$\frac {d<A>} {dt} = \frac{1}{i\hbar}<[\hat A,\hat H]>$$
Does this mean I also have to find the expectation value of the Hamiltonian operator?
Thanks