Revised list of TBCs

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Chapter22 Crystals"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Example 22.1, Page no.81"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "distance between planes = 50.0 M A\n",
+      "distance between planes = 70.71 M A\n",
+      "distance between planes = 28.87 M A\n"
+     ]
+    }
+   ],
+   "source": [
+    "import math\n",
+    "#initialisation of variables\n",
+    "from math import sqrt\n",
+    "d=0.856 #g/ cc\n",
+    "N=6*10**23 # molecules\n",
+    "M=39.1 #g moleˆ−1\n",
+    "n=2\n",
+    "n1=4\n",
+    "n2=12\n",
+    "#CALCULATIONS \n",
+    "a=(n*M/(N*d))**(1/3) \n",
+    "d=a*10**8/ sqrt(n1)\n",
+    "d1=a*10**8/ sqrt(n) \n",
+    "d2=a*10**8/ sqrt(n2) \n",
+    "#RESULTS\n",
+    "d=d/10**6\n",
+    "d1=d1/10**6\n",
+    "d2=d2/10**6\n",
+    "d1=round(d1,2)\n",
+    "d2=round(d2,2)\n",
+    "print 'distance between planes =',d,'M A'\n",
+    "print 'distance between planes =',d1,'M A'\n",
+    "print 'distance between planes =',d2,'M A'"
+   ]
+  }
+ ],
+ "metadata": {
+  "anaconda-cloud": {},
+  "kernelspec": {
+   "display_name": "Python [Root]",
+   "language": "python",
+   "name": "Python [Root]"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.11"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}