Greetings all this is my first post in this forum. I've got a Solid state physics homework question (i know that the intent of this forum is not to do homework, all i want is guidence in the correct direction not the answer itself.) Any way here it is: A conduction band electron in silicon is in the (100) valley and has a k-vector of 2pi/a (1.0, 0.1, 0.1). Calculate the energy of the electron measured from the conduction band edge. Here 'a' is the lattice constant of silicon (5.43 Å). Any ideas on where to begin?