The electron density in a piece of silicon at room temperature is twice the intrinsic density.(a)calculate the hole density, and estimate the number of broken bonds in 1 cm3.(5+ 5points)(b)calculate the doping densityassuming only one type of dopants present in the semiconductor. what is the type of dopant atoms(donor or + 2points)(c)draw the energy band diagramand calculate (퐸퐹−퐸푖 points)

What are the 4 phases of matter in order of increasing engery content?

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.

Which of the following electromagnetic waves can create ions?