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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 7: CLASSIFICATION OF SOLIDS"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.1: CALCULATE_ENERGY_GAP.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;clear;\n",
+"//Example 7.1\n",
+"\n",
+"//given data\n",
+"W=11000;//wavelength in angrstrom\n",
+"\n",
+"//calcuations\n",
+"Eg=W/12400;\n",
+"disp(Eg,'Energy Gap in eV')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.2: FIND_MOBILITY_OF_ELECTRONS.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;clear;\n",
+"//Example 7.2\n",
+"\n",
+"//given data\n",
+"p=1.7*10^-6;//resistivity in ohm-cm\n",
+"d=8.96;//density in gm/cc\n",
+"W=63.5;\n",
+"Na=6.02*10^23;//Avgraodo no. in 1/g mole\n",
+"e=1.6*10^-19;//the charge on electron in C\n",
+"\n",
+"//calcualtions\n",
+"n=8.96*Na/W;\n",
+"ue=1/(p*e*n);\n",
+"disp(ue,'mobilty of electrons in cm^2/V-s');"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.3: FIND_RESISTIVITY.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;clear;\n",
+"//Example 7.3\n",
+"\n",
+"//given data\n",
+"d1=2.5*10^19;//density of charge carries in 1/m^3\n",
+"d2=4.2*10^28;//density of germanium atoms\n",
+"ue=0.36;//mobilty of electrons in m^2/V-s\n",
+"Na=6.02*10^23;//Avgraodo no. in 1/g mole\n",
+"e=1.6*10^-19;//the charge on electron in C\n",
+"\n",
+"//calcualtions\n",
+"Nd=d2/10^6;\n",
+"cn=Nd*e*ue;\n",
+"pn=1/cn;\n",
+"disp(pn,'resistivity of doped germanium in ohm-m')"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 7.4: CALCULATE_WAVELENGTH.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;clear;\n",
+"//Example 7.4\n",
+"\n",
+"//given data\n",
+"Eg=0.75;//energy gap in eV\n",
+"\n",
+"//calcualtions\n",
+"W=12400/Eg;\n",
+"disp(W,'wavelength in angstrom')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}