adding book

1 files changed, 15 insertions, 176 deletions

diff --git a/Engineering_Physics/Chapter2_1.ipynb b/Engineering_Physics/Chapter2_1.ipynb
index 3d6c503f..fff10b22 100755
--- a/Engineering_Physics/Chapter2_1.ipynb
+++ b/Engineering_Physics/Chapter2_1.ipynb
@@ -1,7 +1,7 @@
 {
  "metadata": {
-  "name": "",
-  "signature": "sha256:2693d83b10c8e62fc8d3ef78c9959c4d8327c36ed1f7884372585d33796bcbc3"
+  "name": "Chapter2",
+  "signature": "sha256:ac80f9dfe1725f11a5d4ce0fbda5ffed825d99c680f116629e5e3fcb8b69c198"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -12,231 +12,70 @@
      "cell_type": "heading",
      "level": 1,
      "metadata": {},
-     "source": [
-      "2: Electromagnetic Theory"
-     ]
+     "source": "2: Lasers"
     },
     {
      "cell_type": "heading",
      "level": 2,
      "metadata": {},
-     "source": [
-      "Example number 2.1, Page number 46"
-     ]
+     "source": "Example number 2.1, Page number 52"
     },
     {
      "cell_type": "code",
      "collapsed": false,
-     "input": [
-      " \n",
-      "#importing modules\n",
-      "from __future__ import division\n",
-      "from sympy import *\n",
-      "import math\n",
-      "\n",
-      "#Variable declaration\n",
-      "C = 10;    #Capacitance of the capacitor(pF)\n",
-      "#given V=0.2*sin(120*math.pi*t) in volts\n",
-      "\n",
-      "#Calculation\n",
-      "C=C*10**-12;     #Capacitance of the capacitor(F)\n",
-      "x, y, z, t = symbols('x y z t')\n",
-      "k, m, n = symbols('k m n', integer=True)\n",
-      "f, g, h = symbols('f g h', cls=Function)\n",
-      "#I = C*dV/dt\n",
-      "#let dV/dt be a\n",
-      "a=diff(0.2*sin(120*math.pi*t),t)     #dV/dt\n",
-      "#value of dV/dt is 75.398223686155*cos(376.991118430775*t)\n",
-      "#for cosine function peak value occurs when 120*math.pi*t = 0\n",
-      "#therefore value of dV/dt becomes d = 75.398223686155\n",
-      "d = 75.398223686155;    #value of dV/dt \n",
-      "I=C*d;     #displacement current(A)\n",
-      "\n",
-      "#Result\n",
-      "print \"value of dV/dt is\",a\n",
-      "print \"displacement current is\",I, \"A\""
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "value of dV/dt is 75.398223686155*cos(376.991118430775*t)\n",
-        "displacement current is 7.53982236862e-10 A\n"
-       ]
-      }
-     ],
-     "prompt_number": 2
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example number 2.2, Page number 46"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      " \n",
-      "#importing modules\n",
-      "from __future__ import division\n",
-      "from sympy import *\n",
-      "import math\n",
-      "\n",
-      "#Variable declaration\n",
-      "epsilon_r = 1;    #Relative electrical permittivity of free space\n",
-      "epsilon_0 = 8.854*10**-12;    #Absolute electrical permittivity of free space(F/m)\n",
-      "#given E=sin(120*math.pi*t) in volts\n",
-      "\n",
-      "#Calculation\n",
-      "x, y, z, t = symbols('x y z t')\n",
-      "k, m, n = symbols('k m n', integer=True)\n",
-      "f, g, h = symbols('f g h', cls=Function)\n",
-      "#J2 = epsilon*dE/dt\n",
-      "epsilon=epsilon_0*epsilon_r;\n",
-      "#let dE/dt be a\n",
-      "a=diff(sin(120*math.pi*t),t)     #dE/dt\n",
-      "#value of dE/dt is 376.991118430775*cos(376.991118430775*t)\n",
-      "#for cosine function peak value occurs when 120*math.pi*t = 0\n",
-      "#therefore value of dE/dt becomes d = 376.991118430775\n",
-      "d = 376.991118430775;    #value of dE/dt\n",
-      "J2=epsilon*d;     #displacement current density(A/m**2)\n",
-      "\n",
-      "#Result\n",
-      "print \"value of dE/dt is\",a\n",
-      "print \"The peak value of displacement current density is\",J2, \"A/m**2\""
-     ],
+     "input": "#importing modules\nimport math\n\n#Variable declaration\nlamda = 590;        #wavelength(nm)\nh = 6.625*10**-34;       #planck's constant\nc = 3*10**8;            #velocity of light(m/s)\nk = 1.38*10**-23;       #boltzmann's constant\nT = 523;                #temperature(Kelvin)\n\n#Calculation\nlamda = lamda*10**-9;      #wavelength(m)      \n#n1byn2 = math.exp(-(E2-E1)/(k*T))\n#but E2-E1 = h*new and new = c/lamda\n#therefore n1byn2 = math.exp(-h*c/(lamda*k*T))\nn1byn2 = math.exp(-h*c/(lamda*k*T));\n\n#Result\nprint \"relative population of Na atoms is\",n1byn2",
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "stream",
        "stream": "stdout",
-       "text": [
-        "value of dE/dt is 376.991118430775*cos(376.991118430775*t)\n",
-        "The peak value of displacement current density is 3.33787936259e-09 A/m**2\n"
-       ]
+       "text": "relative population of Na atoms is 5.36748316686e-21\n"
       }
      ],
-     "prompt_number": 3
+     "prompt_number": 1
     },
     {
      "cell_type": "heading",
      "level": 2,
      "metadata": {},
-     "source": [
-      "Example number 2.3, Page number 47 (Theoritical proof)"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example number 2.4, Page number 47"
-     ]
+     "source": "Example number 2.2, Page number 53"
     },
     {
      "cell_type": "code",
      "collapsed": false,
-     "input": [
-      " \n",
-      "#importing modules\n",
-      "from __future__ import division\n",
-      "import math\n",
-      "\n",
-      "#Variable declaration\n",
-      "p = 60;    #Power rating of bulb(W)\n",
-      "d = 0.5;    #Distance from the bulb(m)\n",
-      "\n",
-      "#Calculation\n",
-      "A=4*math.pi*d**2;    #area(m**2)\n",
-      "P = p/A;    #Value of Poynting vector(W/m**2)\n",
-      "P = math.ceil(P*100)/100;    #rounding off value of P to 1 decimal\n",
-      "\n",
-      "#Result\n",
-      "print \"The value of Poynting vector is\",P, \"W/m**2\""
-     ],
+     "input": "#importing modules\nimport math\n\n#Variable declaration\nlamda = 590;        #wavelength(nm)\nh = 6.625*10**-34;       #planck's constant\nc = 3*10**8;            #velocity of light(m/s)\nk = 1.38*10**-23;       #boltzmann's constant\nT = 523;                #temperature(Kelvin)\n\n#Calculation\nlamda = lamda*10**-9;      #wavelength(m)      \n#n21dashbyn21 = 1/(math.exp(h*new/(k*T))-1)\n#but new = c/lamda\n#therefore n21dashbyn21 = 1/(math.exp(h*c/(lamda*k*T))-1)\nA = math.exp(h*c/(lamda*k*T))-1;\nn21dashbyn21 = 1/A;    \n\n#Result\nprint \"ratio of stimulated to spontaneous emission is\",n21dashbyn21\nprint \"answer given in the book is wrong\"",
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "stream",
        "stream": "stdout",
-       "text": [
-        "The value of Poynting vector is 19.1 W/m**2\n"
-       ]
+       "text": "ratio of stimulated to spontaneous emission is 5.36748316686e-21\nanswer given in the book is wrong\n"
       }
      ],
-     "prompt_number": 4
+     "prompt_number": 2
     },
     {
      "cell_type": "heading",
      "level": 2,
      "metadata": {},
-     "source": [
-      "Example number 2.5, Page number 47"
-     ]
+     "source": "Example number 2.3, Page number 53"
     },
     {
      "cell_type": "code",
      "collapsed": false,
-     "input": [
-      " \n",
-      "#importing modules\n",
-      "from __future__ import division\n",
-      "import math\n",
-      "\n",
-      "#Variable declaration\n",
-      "E_peak = 6;    #Peak value of electric field intensity(V/m)\n",
-      "c = 3*10**8;    #Speed of electromagnetic wave in free space(m/s)\n",
-      "mew_0 = 4*math.pi*10**-7;    #Absolute permeability of free space(Tm/A)\n",
-      "epsilon_0 = 8.854*10**-12;    #Absolute permittivity of free space(F/m)\n",
-      "mew_r = 1;    #Relative permeability of medium\n",
-      "epsilon_r = 3;    #Relative permittivity of the medium\n",
-      "\n",
-      "#Calculation\n",
-      "v = c/math.sqrt(mew_r*epsilon_r);    #Wave velocity(m/s)\n",
-      "v = v/10**8;\n",
-      "v = math.ceil(v*10**4)/10**4;     #rounding off the value of v to 4 decimals\n",
-      "eta = math.sqrt((mew_0/epsilon_0)*(mew_r/epsilon_r));    #Intrinsic impedance of the medium(ohm)\n",
-      "eta = math.ceil(eta*10)/10;     #rounding off the value of v to 1 decimal\n",
-      "H_P = E_peak/eta;     #Peak value of the magnetic intensity(A/m)\n",
-      "H_P = H_P*10**2;\n",
-      "H_P = math.ceil(H_P*10**2)/10**2;     #rounding off the value of v to 2 decimals\n",
-      "\n",
-      "#Result\n",
-      "print \"The wave velocity is\",v,\"*10**8 m/s\"\n",
-      "print \"The intrinsic impedance of the medium is\",eta, \"ohm\"\n",
-      "print \"The peak value of the magnetic intensity is\",H_P,\"*10**-2 A/m\""
-     ],
+     "input": "#importing modules\nimport math\n\n#Variable declaration\nlamda = 632.8;        #wavelength of laser(nm)\nh = 6.625*10**-34;       #planck's constant\nc = 3*10**8;            #velocity of light(m/s)\np = 3.147;              #output power(mW)\n\n#Calculation\np = p*10**-3;          #output power(W)\nlamda = lamda*10**-9;      #wavelength(m)      \nnew = c/lamda;             #frequency(Hz)\nE = h*new;                 #energy of each photon(J)\nEm = p*60;                 #energy emitted per minute(J/min)\nN = Em/E;                  #number of photons emitted per second\n\n#Result\nprint \"number of photons emitted per second is\",N",
      "language": "python",
      "metadata": {},
      "outputs": [
       {
        "output_type": "stream",
        "stream": "stdout",
-       "text": [
-        "The wave velocity is 1.7321 *10**8 m/s\n",
-        "The intrinsic impedance of the medium is 217.6 ohm\n",
-        "The peak value of the magnetic intensity is 2.76 *10**-2 A/m\n"
-       ]
+       "text": "number of photons emitted per second is 6.01183879245e+17\n"
       }
      ],
-     "prompt_number": 11
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
+     "prompt_number": 3
     }
    ],
    "metadata": {}