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.

How many hydrogen (h) atoms are in one molecule of sulfuric acid, h2so4? (1 points) 1 2 4 7

If anyone who can me with this hw? i would really appreciate it

You are the coordinator for a program that is going to take place at night in a rectangular amphitheater in the mountains. you will have no access to any electricity, but you must be able to illuminate the entire grounds. you know the intensity of the light from a lantern varies inversely as the square of the distance from the lantern. suppose the intensity is 90 when the distance is 5 m. a. write an equation to model the situation. b. solve for the constant of variation. c. write the equation to model the situation using the constant () of variation. d. you have been given lanterns with 40 light intensity. use your equation to solve for the distance from the lantern. e. you need to illuminate 225 km. how many meters do you need to light? f. how many lanterns will you need?