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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": {}
+  }
+ ]
+}
+\ No newline at end of file