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diff --git a/backup/Modern_Physics_version_backup/Chapter11.ipynb b/backup/Modern_Physics_version_backup/Chapter11.ipynb new file mode 100755 index 00000000..8b1cca27 --- /dev/null +++ b/backup/Modern_Physics_version_backup/Chapter11.ipynb @@ -0,0 +1,151 @@ +{ + "metadata": { + "name": "Chapter11" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 11:Solid State Physics" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.1, Page 346" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initiation of variable\n", + "c=769.0*10**3; Na=6.023*10**23; JeV=1.6*10**-19; #various constants and given values\n", + "\n", + "#calculation\n", + "Be=c/(Na*JeV); #Binding energy of an ion pair in the lattice\n", + "\n", + "#result\n", + "print\"The experimental value was found out to be in eV.\",round(Be,5);\n", + "\n", + "#partb\n", + "n=9.0;a=1.7476; R=0.281; k= 1.44; #Given values and consstants\n", + "Bc=k*a*(1-(1/n))/R; #ionic binding energy experimentally\n", + "\n", + "#result\n", + "print\"The calculated value of the binding energy in eV.is\",round(Bc,4);\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The experimental value was found out to be in eV. 7.97983\n", + "The calculated value of the binding energy in eV.is 7.9606\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.2, Page 350" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initiation of variable\n", + "a=3.61;# amount of energy required to remove an electron from Cl- ion\n", + "b=-5.14 #amount of energy returned when an electron is added to Na+ ion\\\n", + "c=7.98 #binding energy of NaCl atom\n", + "\n", + "#calculation\n", + "E=a+b+c #sum of all the energies\n", + "print\"The net energy to be supplied in eV is\",round(E,3);" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The net energy to be supplied in eV is 6.45\n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 11.3, Page 355" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "#initiation of variable\n", + "from math import exp,sqrt\n", + "Na=6.023*10**23; p=8.96*10**3; M=63.5*10**-3; #Na=avagadro's number,p=density,M=molar mass\n", + "\n", + "#calculation\n", + "n= p*Na/M; #density of charge carriers\n", + "\n", + "#result'\n", + "print\"The density of charge carriers in copper in atoms/m3 is %.1e\" %round(n,3);\n", + "\n", + "s=5.88*10**7;m=9.11*10**-31;e=1.6*10**-19; #charge & mass of an electron,resistance per unit length\n", + "t= s*m/(n*e**2); #average time between collisions\n", + "\n", + "#result\n", + "print \"The average time between collisions of conducting electrons in sec.is %.1e\" %t\n", + "\n", + "#partb\n", + "Ef=7.03*1.6*10**-19; #converting given enrgy to J\n", + "\n", + "#calculation\n", + "Vf=sqrt(2*Ef/m); #fermi velocity\n", + "l=Vf*t; #mean free path\n", + "\n", + "#result\n", + "print \"The average mean free path is\",l,\"m =\",round(l*10**9,3),\" nm\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The density of charge carriers in copper in atoms/m3 is 8.5e+28\n", + "The average time between collisions of conducting electrons in sec.is 2.5e-14\n", + "The average mean free path is 3.8690296096e-08 m = 38.69 nm\n" + ] + } + ], + "prompt_number": 1 + } + ], + "metadata": {} + } + ] +}
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