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   "cell_type": "markdown",
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   "source": [
    "# 1: Atomic Spectra"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example number 1, Page number 42"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "wavelength separation is 0.168 angstrom\n",
      "answer 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",
    "B=1;    #flux density(Wb/m**2)\n",
    "lamda=6000*10**-10;      #wavelength(m)\n",
    "m0=9.1*10**-31;        #mass(kg)\n",
    "c=3*10**8;      #velocity of light(m/sec)\n",
    "\n",
    "#Calculations\n",
    "d_lamda=B*e*(lamda**2)/(4*math.pi*m0*c);     #wavelength separation(m)\n",
    "d_lamda=d_lamda*10**10;      #wavelength separation(angstrom)\n",
    "\n",
    "#Result\n",
    "print \"wavelength separation is\",round(d_lamda,3),\"angstrom\"\n",
    "print \"answer in the book is wrong\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {
    "collapsed": true
   },
   "source": [
    "## Example number 2, Page number 42"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "magnetic field is 5.89 *10**-2 tesla\n"
     ]
    }
   ],
   "source": [
    "#importing modules\n",
    "import math\n",
    "from __future__ import division\n",
    "\n",
    "#Variable declaration    \n",
    "h=6.6*10**-34;        #planck's constant\n",
    "delta_v=8.3*10**8;     #frequency separation(Hz)\n",
    "mewB=9.3*10**-24;      #magnetic moment\n",
    "\n",
    "#Calculations\n",
    "B=h*delta_v/mewB;       #magnetic field(tesla)\n",
    "\n",
    "#Result\n",
    "print \"magnetic field is\",round(B*10**2,2),\"*10**-2 tesla\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example number 3, Page number 42"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "ratio of charge to mass of electron is 1.753 *10**11 coulomb/kg\n",
      "answer in the book varies due to rounding off errors\n"
     ]
    }
   ],
   "source": [
    "#importing modules\n",
    "import math\n",
    "from __future__ import division\n",
    "\n",
    "#Variable declaration    \n",
    "dv=120*10**6;      #frequency(Hz)\n",
    "B=8.6*10**-3;      #flux density(T)\n",
    "\n",
    "#Calculations\n",
    "r=4*math.pi*dv/B;       #ratio of charge to mass of electron(coulomb/kg)\n",
    "\n",
    "#Result\n",
    "print \"ratio of charge to mass of electron is\",round(r/10**11,3),\"*10**11 coulomb/kg\"\n",
    "print \"answer in the book varies due to rounding off errors\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example number 4, Page number 42"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "the three wavelengths are 4226.4 angstrom 4226.73 angstrom 4227.06 angstrom\n",
      "answers for wavelengths given in the book are 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",
    "B=4;    #flux density(Wb/m**2)\n",
    "lamda=4226.73*10**-10;      #wavelength(m)\n",
    "m0=9.1*10**-31;        #mass(kg)\n",
    "c=3*10**8;      #velocity of light(m/sec)\n",
    "\n",
    "#Calculations\n",
    "d_lamda=B*e*(lamda**2)/(4*math.pi*m0*c);     #wavelength separation(m)\n",
    "d_lamda=round(d_lamda*10**10,2);      #wavelength separation(angstrom)\n",
    "l1=(lamda*10**10)-d_lamda;\n",
    "l2=lamda*10**10;\n",
    "l3=(lamda*10**10)+d_lamda;       #three wavelengths\n",
    "\n",
    "#Result\n",
    "print \"the three wavelengths are\",l1,\"angstrom\",l2,\"angstrom\",l3,\"angstrom\"\n",
    "print \"answers for wavelengths given in the book are wrong\""
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example number 5, Page number 43"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "ratio of charge to mass of electron is 1.75 *10**11 C/kg\n"
     ]
    }
   ],
   "source": [
    "#importing modules\n",
    "import math\n",
    "from __future__ import division\n",
    "\n",
    "#Variable declaration    \n",
    "dlamda=0.0116*10**-9;      #frequency(m)\n",
    "B=1;      #flux density(T)\n",
    "lamda=500*10**-9;         #wavelength(m)\n",
    "c=3*10**8;         #velocity of light(m/sec)\n",
    "\n",
    "#Calculations\n",
    "r=4*math.pi*c*dlamda/(B*lamda**2);       #ratio of charge to mass of electron(coulomb/kg)\n",
    "\n",
    "#Result\n",
    "print \"ratio of charge to mass of electron is\",round(r/10**11,2),\"*10**11 C/kg\""
   ]
  }
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