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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
+}