- #1
Werbel22
- 8
- 0
Homework Statement
Show [a+,a-] = -1,
Where a+ = 1/((2)^0.5)(X-iP)
and a- = 1/((2)^0.5)(X+iP)
and
X = ((mw/hbar)^0.5)x
P = (-i(hbar/mw)^0.5)(d/dx)2. The attempt at a solution
It would take forever to write it all up, but in summary:
I said:
[a+,a-] = (a+a- - a-a+)
then subbed in equations to finally get:
-((hbar/mw)^0.5)(d/dx)((mw/hbar)^0.5)x +((hbar/mw)^0.5)(d/dx)((mw/hbar)^0.5)xwhich cancels out to zero, I don't get why! I made sure I did them in the right order, is there something I'm missing? Is it not just a matter of subbing these formulae in?
I put lambda as the wavefunction in when I was doing it on paper, so that the (d/dx) had something to operate on, but it didn't seem to help as it still gives zero.
Please help, I'm really stuck as to what to do :(