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a)let be a pure semiconductor in two dimensions then they ask you for the density of electrons....would you use the formula

n**2=Nc*Pv*Exp(-Eg/K2T) ?...

another question is to obtain the density of holes in the valence band..what is the expresion?.

b)g(e)=g(e1)*g(e2) then *= is + (summed) or X (multiplication)

c)How varies the density of states with pressure?..will the width of the g(e) increase or decrease?..

hope someone can help..