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clc
T1=500
disp(" Temperature 1 = "+string(T1)+"K") //initializing the value of temperature 1.
Nv=2*10^19
disp(" Nv = "+string(Nv)+"cm^-3")//initializing the value of effective density of state for valence band .
T2=300
disp(" Temperature 2 = "+string(T2)+"K")//initializing the value of temperature 2.
NV=(Nv*((500/300)^(3/2)))
disp("NV at 500K=(Nv((500/300)^(3/2))))= "+string(NV)+" cm^-3 ")//calculation
//this is solved problem 2.9 of chapter 2.
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