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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:d811f941685df0c27130d7c823a224d6aa75e253b0c49d58341e9220ca07cdb5"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter16-Structure of Solids"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg483"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 16.1\n",
+      "##calculation of density\n",
+      "\n",
+      "##given values\n",
+      "a=3.36*10**-10;##lattice constant in m\n",
+      "M=209.;##atomicmass of polonium in kg\n",
+      "N=6.02*10**26;##avogadro's number\n",
+      "z=1.;##no of atom\n",
+      "##calculation\n",
+      "d=z*M/(N*a**3)\n",
+      "\n",
+      "print'%s %.2f %s'%('density (in kg/m^3) is',d,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "density (in kg/m^3) is 9152.34 \n"
+       ]
+      }
+     ],
+     "prompt_number": 7
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg483"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 16.2\n",
+      "##calculation of no of atoms\n",
+      "\n",
+      "##given values\n",
+      "a=4.3*10**-10;##edge of unit cell in m\n",
+      "d=963.;##density in kg/m**3\n",
+      "M=23.;##atomicmass of sodium in kg\n",
+      "N=6.02*10**26;##avogadro's number\n",
+      "\n",
+      "##calculation\n",
+      "z=d*N*a**3./M;\n",
+      "\n",
+      "print'%s %.2f %s'%('no of atoms is',z,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "no of atoms is 2.00 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex3-pg483"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 16.3\n",
+      "##calculation of distance\n",
+      "\n",
+      "##given values\n",
+      "z=4.;##no of atoms in fcc\n",
+      "d=2180.;##density in kg/m**3\n",
+      "M=23+35.3;##atomicmass of sodium chloride in kg\n",
+      "N=6.02*10**26;##avogadro's number\n",
+      "\n",
+      "##calculation\n",
+      "a1=z*M/(N*d);\n",
+      "a=a1**(1/3.);\n",
+      "l=a/2.;##in m\n",
+      "\n",
+      "print'%s %.2f %s'%('distance between adjacent chlorine and sodium atoms in armstrong is',l*10**10,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "distance between adjacent chlorine and sodium atoms in armstrong is 2.81 \n"
+       ]
+      }
+     ],
+     "prompt_number": 4
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex4-pg495"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "##Example 16.4\n",
+      "##calculation of interatomic spacing\n",
+      "\n",
+      "##given values\n",
+      "alpha=30*math.pi/180.;##Bragg angle in degree\n",
+      "h=1;\n",
+      "k=1;\n",
+      "l=1;\n",
+      "m=1;##order of reflection\n",
+      "x=1.75*10**-10;##wavelength in m\n",
+      "\n",
+      "##calculation\n",
+      "d=m*x/(2.*math.sin(alpha));\n",
+      "a=d*math.sqrt(h**2+k**2+l**2.);##in m\n",
+      "\n",
+      "print'%s %.2f %s'%('interatomic spacing in armstrong is',a*10**10,'');\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "interatomic spacing in armstrong is 3.03 \n"
+       ]
+      }
+     ],
+     "prompt_number": 6
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file