From 4a1f703f1c1808d390ebf80e80659fe161f69fab Mon Sep 17 00:00:00 2001
From: Thomas Stephen Lee
Date: Fri, 28 Aug 2015 16:53:23 +0530
Subject: add books

---
 .../Chapter12_1.ipynb                              | 159 +++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100755 Engineering_Physics_by_P.K.Palanisamy/Chapter12_1.ipynb

(limited to 'Engineering_Physics_by_P.K.Palanisamy/Chapter12_1.ipynb')

diff --git a/Engineering_Physics_by_P.K.Palanisamy/Chapter12_1.ipynb b/Engineering_Physics_by_P.K.Palanisamy/Chapter12_1.ipynb
new file mode 100755
index 00000000..93ea352e
--- /dev/null
+++ b/Engineering_Physics_by_P.K.Palanisamy/Chapter12_1.ipynb
@@ -0,0 +1,159 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#12: Lasers"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 12.1, Page number 12.5"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "relative population is 1.0764 *10**-30\n",
+      "answer given in the book is wrong\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "e=1.6*10**-19;     #charge(coulomb)\n",
+    "h=6.6*10**-34;     #planck's constant(J sec)\n",
+    "c=3*10**8;     #velocity of light(m/sec)\n",
+    "lamda=6943*10**-10;     #wavelength(m)\n",
+    "k=8.61*10**-5;\n",
+    "T=300;    #temperature(K)\n",
+    "\n",
+    "#Calculation\n",
+    "dE=h*c/(e*lamda);\n",
+    "N2byN1=math.exp(-dE/(k*T));     #relative population\n",
+    "\n",
+    "#Result\n",
+    "print \"relative population is\",round(N2byN1*10**30,4),\"*10**-30\"\n",
+    "print \"answer given in the book is wrong\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 12.2, Page number 12.13"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 7,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "divergence is 1.0 milli radian\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "a1=4*10**-3;      #diameter(m)\n",
+    "a2=6*10**-3;      #diameter(m)\n",
+    "d1=1;     #distance(m)\n",
+    "d2=2;     #distance(m)\n",
+    "\n",
+    "#Calculation\n",
+    "theta=(a2-a1)/(2*(d2-d1));     #divergence(radian)\n",
+    "\n",
+    "#Result\n",
+    "print \"divergence is\",theta*10**3,\"milli radian\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 12.3, Page number 12.45"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 12,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "spot size is 0.867 micro m\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "s=1*10**-3;    #size(m)\n",
+    "l=1*10**-3;    #length(m)\n",
+    "lamda=650*10**-9;    #wavelength(m)\n",
+    "\n",
+    "#Calculation\n",
+    "tantheta=(l/2)/s;     \n",
+    "theta=math.atan(tantheta);    #angle(radian)\n",
+    "sintheta=round(math.sin(theta),2);\n",
+    "ss=0.6*lamda/sintheta;     #spot size(m)\n",
+    "\n",
+    "#Result\n",
+    "print \"spot size is\",round(ss*10**6,3),\"micro m\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}
-- 
cgit