initial commit / add all books

9 files changed, 112 insertions, 0 deletions

diff --git a/3020/CH17/EX17.1/ex17_1.sce b/3020/CH17/EX17.1/ex17_1.sce
new file mode 100755
index 000000000..93b4b4868
--- /dev/null
+++ b/3020/CH17/EX17.1/ex17_1.sce
@@ -0,0 +1,32 @@
+clc;

+clear all;

+pCu=8.96e3;//density of copper in kg*m^-3

+pZn=7.14e3;//density of Zn in kg*m^-3

+pAl=2.70e3;//density of Al in kg*m^-3

+MCu=63.55;//atomic weight of Cu

+MZn=65.38;//atomic weight of Zn

+MAl=27.0;//atomic weight of Al

+N=6.022*1e26;//avogadro's constant

+x=1;//no of free electrons per atom

+h=6.626e-34;

+me=9.1e-31;

+

+//for Cu

+n=pCu*N*x/MCu;//concentration of electron in Cu

+Efo=(h*h/(8*me))*((3*n/%pi)^(2/3));//fermi energy at 0K

+Efo1=Efo/(1.6e-19);//convertion into eV from J

+disp('eV',Efo1,'fermi energy at 0 K');

+

+//for Zn

+x=2;

+n=pZn*N*x/MZn;//concentration of electron in Zn

+Efo=(h*h/(8*me))*((3*n/%pi)^(2/3));//fermi energy at 0K

+Efo1=Efo/(1.6e-19);//convertion into eV from J

+disp('eV',Efo1,'fermi energy at 0 K');

+

+//for Al

+x=3;

+n=pAl*N*x/MAl;//concentration of electron in Al

+Efo=(h*h/(8*me))*((3*n/%pi)^(2/3));//fermi energy at 0K

+Efo1=Efo/(1.6e-19);//convertion into eV from J

+disp('eV',Efo1,'fermi energy at 0 K');

diff --git a/3020/CH17/EX17.2/ex17_2.sce b/3020/CH17/EX17.2/ex17_2.sce
new file mode 100755
index 000000000..57faeea01
--- /dev/null
+++ b/3020/CH17/EX17.2/ex17_2.sce
@@ -0,0 +1,12 @@
+clc;

+clear all;

+h=6.626e-34;//planck's constant

+me=9.1e-31; //Mass of electron in Kg

+T=0;//temperature

+n=8.4905e28;

+Efo=(h*h/(8*me))*((3*n/%pi)^(2/3));//fermi energy at 0K in J

+Efo1=Efo/(1.6e-19);//convertion into eV from J

+disp('eV',Efo1,'fermi energy at 0 K');

+lemda=6.82e27;

+Z=lemda*sqrt(Efo1)/2;//density of states for Cu at fermi level

+disp('m^-3',Z,'density of states for Cu at fermi level is:')

diff --git a/3020/CH17/EX17.3/ex17_3.sce b/3020/CH17/EX17.3/ex17_3.sce
new file mode 100755
index 000000000..d9767c1b1
--- /dev/null
+++ b/3020/CH17/EX17.3/ex17_3.sce
@@ -0,0 +1,8 @@
+clc;

+clear all;

+rhoNi=63e-9;//resistivity of Ni in ohm*m

+rhoCr=129e-9;//resistivity of Cr in ohm*m

+rhoNiCr=1120e-9;//resistivity of 80% Ni +20% Cr in ohm*m

+X=0.8;//atomic fraction

+C=rhoNiCr/(X*(1-X));//'Nordheim constant 

+disp('ohm*m',C,'Nordheim constant is:')

diff --git a/3020/CH17/EX17.4/ex17_4.sce b/3020/CH17/EX17.4/ex17_4.sce
new file mode 100755
index 000000000..93e8cdec4
--- /dev/null
+++ b/3020/CH17/EX17.4/ex17_4.sce
@@ -0,0 +1,13 @@
+clc;

+clear all;

+rho=2.7e3;//density of Al in Kg/m^3

+m=27;//atomic weight of Al

+to=1e-14;//relexation time in second

+Na=6.022e26;

+e=1.6e-19;

+x=3;//no of electrons per atom

+n=rho*Na*x/m;//no of electron available per m^3

+disp('m^-3',n,'no of electron available in Al is');

+me=9.1e-31;

+sigma=n*e*e*to/me;//conductivity of Al

+disp('ohm*m',sigma,'conductivity of Al is:')

diff --git a/3020/CH17/EX17.5/ex17_5.sce b/3020/CH17/EX17.5/ex17_5.sce
new file mode 100755
index 000000000..8e01955fa
--- /dev/null
+++ b/3020/CH17/EX17.5/ex17_5.sce
@@ -0,0 +1,10 @@
+clc;

+clear all;

+Ed=0.01;//difference between energy level to fermi level

+Ed1=Ed*1.6e-19;//convertion from eV to J

+T=200;//temperature in kelvin

+k=1.38e-23;//boltzmann constant

+x=Ed1/(k*T);//temporary variable

+F=1/(1+exp(x));//fermi distribution function

+disp('',F,'fermi distribution function is:')

+

diff --git a/3020/CH17/EX17.6/ex17_6.sce b/3020/CH17/EX17.6/ex17_6.sce
new file mode 100755
index 000000000..b200600ce
--- /dev/null
+++ b/3020/CH17/EX17.6/ex17_6.sce
@@ -0,0 +1,9 @@
+clc;

+clear all;

+v=0.86e6;//velocity of electron in m/s

+m=9.1e-31;// Mass of electron in Kg

+e=1.6e-19;// Charge of electron

+k=1.38e-23;//boltzmann constant

+Ef=m*v*v/2;//fermi energy

+Tf=Ef/k;//The fermi temperature

+disp('K',Tf,'The fermi temperature is:')

diff --git a/3020/CH17/EX17.7/ex17_7.sce b/3020/CH17/EX17.7/ex17_7.sce
new file mode 100755
index 000000000..326e702e6
--- /dev/null
+++ b/3020/CH17/EX17.7/ex17_7.sce
@@ -0,0 +1,13 @@
+clc;

+clear all;

+m=9.1e-31; // Mass of electron in Kg

+e=1.6e-19; // Charge of electron

+h=6.63e-34;//planck constant

+Ef=3;//fermi energy in eV

+Ed=0.01;//energy interval in eV

+E1=Ef*e;//At ground state

+E2=E1+(Ed*e);

+x=(2*((E2^(3/2))-(E1^(3/2))))/3;//temporary variable

+n=(4*%pi*x*((2*m)^(3/2)))/(h^3);//no of states between the energy level

+disp('',n,'no of states between the energy level is:')

+// Asbolutely wrong answer in book... Checked in calculator

diff --git a/3020/CH17/EX17.8/ex17_8.sce b/3020/CH17/EX17.8/ex17_8.sce
new file mode 100755
index 000000000..93aaf8c18
--- /dev/null
+++ b/3020/CH17/EX17.8/ex17_8.sce
@@ -0,0 +1,7 @@
+clc;

+clear all;

+Tf=24600;//temperature in kelvin

+m=9.11e-31;//mass of electron

+k=1.38e-23;//boltzmann constant

+Vf=sqrt(2*k*Tf/m);//fermi velocity 

+disp('m/s',Vf,'fermi velocity is:')

diff --git a/3020/CH17/EX17.9/ex17_9.sce b/3020/CH17/EX17.9/ex17_9.sce
new file mode 100755
index 000000000..5f7ccb215
--- /dev/null
+++ b/3020/CH17/EX17.9/ex17_9.sce
@@ -0,0 +1,8 @@
+clc;

+clear all;

+h=6.626e-34;//planck's constant

+m=9.1e-31;//mass of electron

+n=18.1e28;//electron density of aluminium

+Efo=(h*h/(2*m))*((3*n/(8*%pi))^(2/3));//fermi energy at 0K

+Efo1=Efo/(1.6e-19);//conversion into eV from J

+disp('eV',Efo1,'fermi energy at 0 K');