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## Main Question or Discussion Point

Right guys, I want to get this one straight...

We have all seen the simple infinite square well a million times. From it, we can get the condition for the k-vector of the electron that

k = n.pi / L

Now, I also come across all the time that k = 2n.pi / L

When do we use which boundary condition? They both seem to come from the same situation, but I cannot see when one is used???

It's a simple situation that's been bugging me a while!! Hope someone can clear this up.

Cheers!

We have all seen the simple infinite square well a million times. From it, we can get the condition for the k-vector of the electron that

k = n.pi / L

Now, I also come across all the time that k = 2n.pi / L

When do we use which boundary condition? They both seem to come from the same situation, but I cannot see when one is used???

It's a simple situation that's been bugging me a while!! Hope someone can clear this up.

Cheers!