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Homework Statement
Particle is in an infinite square well of width ##L## on an interval ##-L/2<x<L/2##. The wavefunction which describes the state of this particle is of form:
$$\psi = A_0\psi_0(x) + A_1\psi_1(x)$$
where ##A_1=1/2## and where ##\psi_0## and ##\psi_1## are ground and first excited state. What are ##\psi_0## and ##\psi_1## like? Write them down. Calculate ##A_0##.
Homework Equations
I allways used this equation to get normalisation factors:
$$\int\limits_{-d/2}^{d/2} \psi =1$$
If i recall corectly the eigenfunctions are orthogonal? I remember something about this and i think there is different way too solve this problem using this orthogonality. Please someone show me, because i am interested in both ways!
The Attempt at a Solution
I know that normalisation factor should be ##A_0=\sqrt{3}/2## but what i got was totaly different. I think i chose ##\psi_0## and ##\psi_1## wrong. Here is how i got the wrong result:
http://shrani.si/?f/OH/aKLhcp9/582013-01837.jpg
Is it possible that I should use ##\psi_0(x) = \cos \left(\frac{(2N-1)\pi}{d}x\right)## where ##\boxed{N=1}## and ##\psi_1(x) = \sin \left(\frac{2N\pi}{d}x\right)## where ##\boxed{N=1}##?
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