# Homework Help: QM Ocillator

1. Apr 9, 2009

### fredrick08

1. The problem statement, all variables and given/known data
The wave function $$\Psi$$(x,t) ofr the lowest energy state of simple harmonic oscillator, consisting of a particle mass m acted on by a linear restoring force F=Cx, where C is the force constant, can be expressed as..
$$\Psi$$(x,t)=Aexp[-($$\sqrt{}Cm$$/2h)x$$^{}2$$-(i/2)($$\sqrt{}C/m$$)t] where A is constant.

a. use the Hamiltonian operator with V(x)=.5x$$^{}2$$, to evaluate the total energy of the state!

2. Relevant equations
Hop(x)=(P$$^{}2$$op/2m)+V(x)
Hop(t)=i*hbar(d/dt)
P$$^{}2$$op=-hbar$$^{}2$$d$$^{}2$$/dx$$^{}2$$

3. The attempt at a solution
ok i am very confused as to which operqator to use, since my wave function is not time independent, but they give me V(x) value...
but to find to total energy all u do is multiply the operator by wave function i think.

can i ask which op do i use?? and is it just multiplying them together?

2. Apr 9, 2009

### latentcorpse

they should give the same answer as its the same state!

but seeing as it says in the question to use the Hamiltonian with $V(x)=\frac{1}{2}x^2$, i'd use the first one you wrote down seeing as it has a V(x) term in it.

3. Apr 9, 2009

ok thanks