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+{
+ "metadata": {
+  "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 13 : Introduction to statistical thermodynamics"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.1 page no : 474"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "p1 = 1./6;\t\t\t#probability for the first throw gives 6\n",
+      "p2 = 1./6;\t\t\t#probability for the first throw gives 5\n",
+      "n = 2;\t    \t\t#the no.of dice are two\n",
+      "\n",
+      "# Calculations\n",
+      "p = p1*p2*n;\t\t\t#the required probability is\n",
+      "\n",
+      "# Result\n",
+      "print 'the required probability is %3.2f'%(p)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "the required probability is 0.06\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.2 pageno : 474"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "p1 = 4./52;\t\t\t#the probability for getting ace in first draw is\n",
+      "p2 = 3./51;\t\t\t#the probability for getting ace in second draw is\n",
+      "p3 = 2./50;\t\t\t#the probability for getting ace in third draw is\n",
+      "p4 = 1./49;\t\t\t#the probability for getting ace in fourth draw is\n",
+      "\n",
+      "# Calculations\n",
+      "p = p1*p2*p3*p4;\t\t\t#total probability is\n",
+      "\n",
+      "# Result\n",
+      "print 'total probability is %3.9f'%(p)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "total probability is 0.000003694\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.3 page no : 475"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "n = 12.;\t\t\t#no.of particles\n",
+      "n1 = 8.;\n",
+      "n2 = 4.;\n",
+      "\n",
+      "# Calculations\n",
+      "p = n*(n-1)*(n-2)*(n-3)/(n2*(n2-1)*(n2-2)*(2**n));\t\t\t#probability of distribution (8,4)\n",
+      "\n",
+      "# Result\n",
+      "print 'probability of distribution 8(4) is %3.5f'%(p)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "probability of distribution 8(4) is 0.12085\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 13.4 page no: 475"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "\n",
+      "# Variables\n",
+      "m = 32;\t\t\t#mass of the oxygen molecule in gm\n",
+      "n = 1.67*10**-27;\t\t\t#mass of one electron\n",
+      "k = 1.38*10**-23;\t\t\t#boltzzmann consmath.tant in ergs/cal\n",
+      "t = 200;\t\t\t#temperature of the oxygen in K\n",
+      "c = (100.+101)/2;\t\t\t#average speed of the oxygen molecule in m/s\n",
+      "\n",
+      "# Calculations\n",
+      "a = m*n/(2*3.14*k*t);\n",
+      "p = 4*3.14*(a**(3./2))*(c**2)*(2.303**(-a));\t\t\t#probability that the oxygen speed is lies between in m/sec\n",
+      "\n",
+      "# Result\n",
+      "print 'probability that the oxygen speed is lies between is %3.6e m/sec'%(p)\n",
+      "print \"Note : answer is slightly different because of rounding error.\""
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "probability that the oxygen speed is lies between is 6.867794e-04 m/sec\n",
+        "Note : answer is slightly different because of rounding error.\n"
+       ]
+      }
+     ],
+     "prompt_number": 10
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file