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{
"metadata": {
"name": "",
"signature": "sha256:bb88588092f5e168d4a1c62bb7bb87ac343b1c2045bd4d31cd2391090ea3e567"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"7: Classification of Solids"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 7.1, Page number 138"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#import modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"W=11000; #wavelength(angstrom)\n",
"\n",
"#Calculation\n",
"Eg=W/12400; #energy gap(eV)\n",
"\n",
"#Result\n",
"print \"Energy Gap is\",round(Eg,3),\"eV\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Energy Gap is 0.887 eV\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 7.2, Page number 138"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#import modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"p=1.7*10**-6; #resistivity(ohm-cm)\n",
"d=8.96; #density(g/cc)\n",
"W=63.5; #atomic weight(gm)\n",
"Na=6.02*10**23; #Avagadro number(per g-mol)\n",
"e=1.6*10**-19; #the charge on electron(C)\n",
"\n",
"#Calculation\n",
"n=8.96*Na/W; #number of Cu atoms per cc\n",
"mewe=1/(p*e*n); #mobility of electrons(cm^2/V-s)\n",
"\n",
"#Result\n",
"print \"mobility of electrons is\",round(mewe,1),\"cm^2/V-s\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"mobility of electrons is 43.3 cm^2/V-s\n"
]
}
],
"prompt_number": 5
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 7.3, Page number 139"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#import modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"d1=2.5*10**19; #density of charge carriers(per m^3)\n",
"d2=4.2*10**28; #density of germanium atoms(per m^3)\n",
"mewe=0.36; #mobilty of electrons(m^2/V-s)\n",
"Na=6.02*10**23; #Avgraodo no.(per g-mol)\n",
"e=1.6*10**-19; #the charge on electron(C)\n",
"\n",
"#Calculation\n",
"Nd=d2/10**6; #density of added impurity atoms(atoms/m^3)\n",
"sigma_n=Nd*e*mewe; #conductivity(mho/m)\n",
"rho_n=1/sigma_n; #resistivity of doped germanium(ohm-m)\n",
"\n",
"#Result\n",
"print \"resistivity of doped germanium is\",round(rho_n*10**3,3),\"*10**-3 ohm-m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"resistivity of doped germanium is 0.413 *10**-3 ohm-m\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 7.4, Page number 139"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#import modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"Eg=0.75; #energy gap(eV)\n",
"\n",
"#Calculation\n",
"lamda=12400/Eg; #wavelength(angstrom)\n",
"\n",
"#Result\n",
"print \"wavelength is\",int(lamda),\"angstrom\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"wavelength is 16533 angstrom\n"
]
}
],
"prompt_number": 12
}
],
"metadata": {}
}
]
}
|
