removing problem statements

1 files changed, 0 insertions, 39 deletions

diff --git a/Fundamental_of_Electronics_Devices/Ch3.ipynb b/Fundamental_of_Electronics_Devices/Ch3.ipynb
index fcc2f572..d78715cf 100644
--- a/Fundamental_of_Electronics_Devices/Ch3.ipynb
+++ b/Fundamental_of_Electronics_Devices/Ch3.ipynb
@@ -27,19 +27,14 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Example 3.2\n",

-      "#What is Minimum required energy \n",

       "\n",

-      "#given data\n",

       "l=6000                 #in Angstrum\n",

       "h=6.6*10**(-34)             #Planks constant\n",

       "c=3*10**8                   #speed of light in m/s\n",

       "e=1.602*10**(-19)            #Constant\n",

       "\n",

-      "#calculation\n",

       "phi=c*h/(e*l*10**(-10))\n",

       "\n",

-      "#result\n",

       "print\"Minimum required energy is\",round(phi,2),\"eV \"\n"

      ],

      "language": "python",

@@ -67,18 +62,13 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Exa 3.3\n",

-      "#calculate Work function of the cathode material\n",

       "\n",

-      "#given data\n",

       "Emax=2.5                   #maximum energy of emitted electrons in eV \n",

       "l=2537.0                #in Angstrum\n",

       "\n",

-      "#Calculation\n",

       "EeV=12400.0/l           #in eV\n",

       "phi=EeV-Emax               #in eV\n",

       "\n",

-      "#result\n",

       "print \"Work function of the cathode material is \",round(phi,2),\"eV\""

      ],

      "language": "python",

@@ -106,12 +96,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Example 3.4\n",

-      "#Find (i)The fraction of each photon energy unit which is converted into heat\",f\n",

-      "#(ii)Energy converted into heat in ,((2-1.43)/2)*0.009,\"J/s\"\n",

-      "#(iii)Number of photons per second given off from recombination events \",0.009/(e*2)\n",

       "\n",

-      "#given data\n",

       "t=0.46*10**-4                 #in centi meters\n",

       "hf1=2                          #in ev\n",

       "hf2=1.43\n",

@@ -122,18 +107,15 @@
       "\n",

       "import math\n",

       "\n",

-      "#Calculation\n",

       "It=Io*math.exp(-alpha*t)           #in mW\n",

       "Iabs=Io-It\n",

       "f=(hf1-hf2)/hf1\n",

       "E=f*Iabs\n",

       "N=Iabs/(e*hf1)\n",

       "\n",

-      "#result\n",

       "print\"(i)Thus power absorbed is \",round(Iabs,3),\"J/s\"\n",

       "print\"(ii)Energy converted into heat is\",round(E,4),\"J/s\"\n",

       "print\"(iii)Number of photons per second given off from recombination events \",round(N,-14)\n",

-      "#In book there is calculation mistake in Number of photons."

      ],

      "language": "python",

      "metadata": {},

@@ -162,11 +144,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Example 3.5\n",

-      "#What is Photoconductor gain \n",

-      "#Electron transit time.\n",

       "\n",

-      "#given data\n",

       "L=100                     #in uM\n",

       "A=10&-7                   #in cm**2\n",

       "th=10**-6                 #in sec\n",

@@ -174,12 +152,10 @@
       "ue=0.13                   #in m**2/V-s\n",

       "uh=0.05                   #in m**2/V-s\n",

       "\n",

-      "#Calculation\n",

       "E=V/(L*10**-6)            #in V/m\n",

       "tn=(L*10**-6)/(ue*E)\n",

       "Gain=(1+uh/ue)*(th/tn)\n",

       "\n",

-      "#result\n",

       "print\"Electron transit time in sec is \",round(tn,10),\"s\"\n",

       "print\"Photoconductor gain is \",Gain"

      ],

@@ -209,19 +185,14 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Example3.6\n",

-      "#Calculate Current flowing through diode .\n",

       "\n",

-      "#given datex\n",

       "import math\n",

       "Io=0.15                    #in uA\n",

       "V=0.12                     #in mVolt\n",

       "Vt=26                      #in mVolt\n",

       "\n",

-      "#calculation\n",

       "I=Io*10**-6*(math.exp(V/(Vt*10**-3))-1)          #in A\n",

       "\n",

-      "#result\n",

       "print\"Current flowing through diode is \",round(I*10**6,2),\"micra A\""

      ],

      "language": "python",

@@ -249,20 +220,15 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Exa 3.7\n",

-      "#Determine the Forward voltage \n",

       "\n",

-      "#given data\n",

       "import math\n",

       "Io=2.5              #in uA\n",

       "I=10                #in mA\n",

       "Vt=26               #in mVolt\n",

       "n=2                 #for silicon\n",

       "\n",

-      "#Calculation\n",

       "V=n*Vt*10**-3*math.log((I*10**-3)/(Io*10**-6))\n",

       "\n",

-      "#Result\n",

       "print \"Forward voltage  is \",round(V,2),\"V\""

      ],

      "language": "python",

@@ -290,10 +256,7 @@
      "cell_type": "code",

      "collapsed": false,

      "input": [

-      "#Example 3.8\n",

-      "#What is Reverse saturation current density \n",

       "\n",

-      "#given data\n",

       "ND=10**21                #in m**-3\n",

       "NA=10**22                #in m**-3\n",

       "De=3.4*10**-3            #in m**2-s**-1\n",

@@ -303,10 +266,8 @@
       "ni=1.6*10**16            #in m**-3\n",

       "e=1.602*10**-19          #constant\n",

       "\n",

-      "#calculation\n",

       "IoA=e*ni**2*(Dh/(Lh*ND)+De/(Le*NA))\n",

       "\n",

-      "#Result\n",

       "print\"Reverse saturation current density is \",round(IoA*10**6,2),\"uA \""

      ],

      "language": "python",