## Sketching Bloch functions

Wave functions of a Kronig-Penny model with the limit (Uo →∞) are considered in this question. The wave functions for k=0, k=1/2, k=$\pi$, k=2$\pi$ in the lowest energy band are sketched.

I don't quite understand how these were sketched. I have attached the graphs on here, could anyone please explain?

Thanks.
Attached Thumbnails

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