The energy e of an electron in the conduction band of a one-dimensional metal is given by asin2(ka) e = where a is a constant, k is the electron wavevector, and a is the atomic spacing. (a) determine the width of the first brillouin zone. (b) if a 2 x 10-10 m, the fermi wavevector is 2.618 x 103 m-1 and the fermi energy is 1 ev, determine the effective mass of electrons at the fermi level (c) this material is found to generate phonons when exposed to infrared light. in point form, describe a mechanism to account for this phenomenon.

Describe the path of the electric current through a circuit?

What is the single most important equation in all of physics?

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?