For a particular semiconductor, eg = 1.50 ev, m p* = 10 mn* , t = 300 k, and ni = 1 x 105 cm^-3.

(a) determine the position of the intrinsic fermi energy level with respect to the center of the bandgap.

(b) impurity atoms are added so that the fermi energy level is 0.45 ev below the center of the bandgap.

(i) are acceptor or donor atoms added?

(ii) what is the concentration of impurity atoms added

What is the radius of the circular path ofa charged particle in a magnetic field?

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron