Identical Particles Take Home exam :

emirrime
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Homework Statement


Two non interacting particles in an infinite potential well. ψn and ψl conditions (n≠l)
find <(x1-x2)^2> when:
1-)particles are distinguishable,
2-)particles are indistinguishable bosons
3-)particles are indistinguishable fermions
 
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Are you allowed to ask for help for a take home exam?

Have you started work on these at all?
 
Matterwave said:
Are you allowed to ask for help for a take home exam?

Have you started work on these at all?

yep I'm allowed to take help coz i will explain it too. and yes i started to work on it but I'm stuck
 
You should show your work/approach so we can better help you where you're stuck.
 
Thread 'Need help understanding this figure on energy levels'

Thread 'Need help understanding this figure on energy levels'

This figure is from "Introduction to Quantum Mechanics" by Griffiths (3rd edition). It is available to download. It is from page 142. I am hoping the usual people on this site will give me a hand understanding what is going on in the figure. After the equation (4.50) it says "It is customary to introduce the principal quantum number, ##n##, which simply orders the allowed energies, starting with 1 for the ground state. (see the figure)" I still don't understand the figure :( Here is...
View full post »
Thread 'Understanding how to "tack on" the time wiggle factor'

Thread 'Understanding how to "tack on" the time wiggle factor'

The last problem I posted on QM made it into advanced homework help, that is why I am putting it here. I am sorry for any hassle imposed on the moderators by myself. Part (a) is quite easy. We get $$\sigma_1 = 2\lambda, \mathbf{v}_1 = \begin{pmatrix} 0 \\ 0 \\ 1 \end{pmatrix} \sigma_2 = \lambda, \mathbf{v}_2 = \begin{pmatrix} 1/\sqrt{2} \\ 1/\sqrt{2} \\ 0 \end{pmatrix} \sigma_3 = -\lambda, \mathbf{v}_3 = \begin{pmatrix} 1/\sqrt{2} \\ -1/\sqrt{2} \\ 0 \end{pmatrix} $$ There are two ways...
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