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

Atank holds 1000 gallons of water, which drains from the bottom of the tank in half an hour. the values in the table show the volume v of water remaining in the tank (in gallons) after t minutes. t(min) 5 10 15 20 25 30v(gal) 694 444 250 111 28 0(a) if p is the point (15, 250) on the graph of v, find the slopes of the secant lines pq when q is the point on the graph with t = 5, 10, 20, 25, and 30.(b) estimate the slope of the tangent line at p by averaging the slopes of two secant lines.(c) use a graph of the function to estimate the slope of the tangent line at p. (this slope represents the rate at which the water is flowing from the tank after 15 minutes.)show all steps.

What is special about a dc circuit ?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)