blob: 386820fea4bd9b7811080686eb7798f5fef6a8b0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
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//
|
