diff options
Diffstat (limited to '3655/CH3')
| -rw-r--r-- | 3655/CH3/EX3.1/Ex3_1.png | bin | 0 -> 41200 bytes | |||
| -rw-r--r-- | 3655/CH3/EX3.1/Ex3_1.sce | 33 | ||||
| -rw-r--r-- | 3655/CH3/EX3.3/Ex3_3.png | bin | 0 -> 38719 bytes | |||
| -rw-r--r-- | 3655/CH3/EX3.3/Ex3_3.sce | 29 | ||||
| -rw-r--r-- | 3655/CH3/EX3.4/Ex3_4.png | bin | 0 -> 43642 bytes | |||
| -rw-r--r-- | 3655/CH3/EX3.4/Ex3_4.sce | 24 | ||||
| -rw-r--r-- | 3655/CH3/EX3.5/Ex3_5.png | bin | 0 -> 52938 bytes | |||
| -rw-r--r-- | 3655/CH3/EX3.5/Ex3_5.sce | 34 |
8 files changed, 120 insertions, 0 deletions
diff --git a/3655/CH3/EX3.1/Ex3_1.png b/3655/CH3/EX3.1/Ex3_1.png Binary files differnew file mode 100644 index 000000000..53f0a005c --- /dev/null +++ b/3655/CH3/EX3.1/Ex3_1.png diff --git a/3655/CH3/EX3.1/Ex3_1.sce b/3655/CH3/EX3.1/Ex3_1.sce new file mode 100644 index 000000000..eb032a131 --- /dev/null +++ b/3655/CH3/EX3.1/Ex3_1.sce @@ -0,0 +1,33 @@ +// Example 3.1 +// Computation for mobility of the free electrons in aluminium// +// Page no.61 + +clc; +clear; +close; + +//Given data ; +d=2.70*10^3//2.70*10^3 kg/m3 +v=3;//3 electrons/atom +A=26.98; +M=1.660*10^-27;//1.660*10^-27 kg/atom +e=1.60*10^-19; +R=3.44*10^-8;//R=resistivity + +//...................................(B)....................................// + +//Calculation for concentration of the free electrons in aluminium// +n=(d*v)/(A*M); + +//Calculation for mobility of the free electrons in aluminium// +mu=10^4/(n*e*R);//mu=mobility of the free electrons + + + +//Displaying the result in command window +printf('\n Concentration of the free electrons in aluminium = %0.3f x 10^29 electron/m3',n*10^-29); +printf('\n \n Mobility of the free electrons in aluminium = %0.2f cm2/V sec',mu); + + + +//Answers are varying due to round off error// diff --git a/3655/CH3/EX3.3/Ex3_3.png b/3655/CH3/EX3.3/Ex3_3.png Binary files differnew file mode 100644 index 000000000..699df4b3e --- /dev/null +++ b/3655/CH3/EX3.3/Ex3_3.png diff --git a/3655/CH3/EX3.3/Ex3_3.sce b/3655/CH3/EX3.3/Ex3_3.sce new file mode 100644 index 000000000..bc17d25fa --- /dev/null +++ b/3655/CH3/EX3.3/Ex3_3.sce @@ -0,0 +1,29 @@ +// Example 3.3 +// Computation for numerical value of n and EF// +// Page no.71 + +clc; +clear; +close; + +//Given data ; +A_num=6.02*10^23;//Avogadro number +atom_wt=184;//Atomic weight +sg=18.8;//specific gravity of tungstan +n_elect=2;//number of electrons +n_atom=1;//number of atom per molecule + + +//Calculation for numerical value of n// +n=(A_num*(1/atom_wt)*sg*n_elect*n_atom)*10^6; + +//Calculation for numerical value of EF// +EF=3.64*10^-19*n^(2/3); + + +//Displaying the result in command window +printf('\n Numerical value of n = %0.2f x 10^29 electron/m3',n*10^-29); +printf('\n \n Numerical value of EF = %0.2f eV',EF); + + +//Answers are varying due to round off error// diff --git a/3655/CH3/EX3.4/Ex3_4.png b/3655/CH3/EX3.4/Ex3_4.png Binary files differnew file mode 100644 index 000000000..e92bf6ed8 --- /dev/null +++ b/3655/CH3/EX3.4/Ex3_4.png diff --git a/3655/CH3/EX3.4/Ex3_4.sce b/3655/CH3/EX3.4/Ex3_4.sce new file mode 100644 index 000000000..386820fea --- /dev/null +++ b/3655/CH3/EX3.4/Ex3_4.sce @@ -0,0 +1,24 @@ +// Example 3.4 +// Computation for percentage of electrons leaving a tungstan filament which can surmount a barrier of height 1eV// +// Page no.78 + +clc; +clear; +close; + +//Given data ; +Vr=1; +VT=2700/11600;//VT=T/11600 + + +//Calculation for percentage of electrons leaving a tungstan filament at 2700 degree K// +P1=(exp(-Vr/VT))*100;//P1=I/Ith + +//Hence only about 1.4% of the electrons have surface-directed energies in excess of 1eV// + + +//Displaying the result in command window +printf('\n Percentage of electrons leaving a tungstan filament which can surmount a barrier of height 1eV = %0.1f percent',P1); + + +//Answers are varying due to round off error// diff --git a/3655/CH3/EX3.5/Ex3_5.png b/3655/CH3/EX3.5/Ex3_5.png Binary files differnew file mode 100644 index 000000000..3d96dccc5 --- /dev/null +++ b/3655/CH3/EX3.5/Ex3_5.png diff --git a/3655/CH3/EX3.5/Ex3_5.sce b/3655/CH3/EX3.5/Ex3_5.sce new file mode 100644 index 000000000..d8ef2e1e9 --- /dev/null +++ b/3655/CH3/EX3.5/Ex3_5.sce @@ -0,0 +1,34 @@ +// Example 3.5 +// Computation for percentage increase in zero-external-field thermoinic-emission current because of the schottky effect// +// Page no.78 + +clc; +clear; +close; + +//Given data ; +V=500;//plate voltage +ra=1;//anode radius +rk=0.01;//cathode radius +r=10^-4; +T=2500; + + + +//Calculation for electric field intensity at the surface of the cathode// +E=(V/(log(ra/rk)))*(1/r); + +//Calculation for percentage increase in zero-external-field thermoinic-emission current because of the schottky effect// +P1=log(%e^((0.434*0.44*E^(1/2))/T));//P1=log(I/Ith) +P2=10^0.0796;//P2=I/Ith + +//I/Ith=1.20,shows that the schottky theory predicts a 20 percent increase over the zero-field emission current// + + +//Displaying the result in command window +printf('\n Electric field intensity at the surface of the cathode = %0.3f x 10^6 V/m',E*10^-6); +printf('\n \n log(I/Ith) = %0.4f ',P1); +printf('\n \n I/Ith = %0.2f ',P2); +printf("\n \n \n \n I/Ith=1.20,shows that the Schottky theory predicts a 20 percent increase over the zero-field emission current."); + +//Answers are varying due to round off error// |
