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diff --git a/Modern_Physics/chapter5.ipynb b/Modern_Physics/chapter5.ipynb new file mode 100755 index 00000000..a4b2fb2a --- /dev/null +++ b/Modern_Physics/chapter5.ipynb @@ -0,0 +1,832 @@ +{
+ "metadata": {
+ "name": "",
+ "signature": "sha256:9388f9d8764031d08c03b951ac3babfe1cafed91339d0e7cf1d9a5afd45176fa"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "5: Quantum Theory"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.1, Page number 97"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W1=4; #wavelength(Angstrom)\n",
+ "W2=1; #wavelength(Angstrom)\n",
+ "e=1.6*10**-19; #the charge on electron(C)\n",
+ "m=9.12*10**-31; #mass of electron(kg)\n",
+ "\n",
+ "#Calculation\n",
+ "E=12400/W1; #energy(eV)\n",
+ "v=math.sqrt(E*e*2/m); #velocity(m/s)\n",
+ "E1=12400/W2; #energy(eV)\n",
+ "v1=math.sqrt(E1*e*2/m); #velocity(m/s)\n",
+ "\n",
+ "#Result\n",
+ "print \"The energy for 4 angstrom wavelength is\",E,\"eV\"\n",
+ "print \"The velocity is\",round(v/1e+6),\"*10**6 m/s\"\n",
+ "print \"The energy for 1 angstrom wavelength is\",E1,\"eV\"\n",
+ "print \"The velocity is\",round(v1/1e+6),\"*10**6 m/s\"\n",
+ "\n",
+ "#answers given in the book are wrong"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The energy for 4 angstrom wavelength is 3100.0 eV\n",
+ "The velocity is 33.0 *10**6 m/s\n",
+ "The energy for 1 angstrom wavelength is 12400.0 eV\n",
+ "The velocity is 66.0 *10**6 m/s\n"
+ ]
+ }
+ ],
+ "prompt_number": 6
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.2, Page number 98"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "f=880*10**3; #frequency(Hz)\n",
+ "P=10*10**3; #Power(W)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "\n",
+ "#Calculation\n",
+ "E=h*f; #energy carried by each photon(J)\n",
+ "n=P/E; #number of photons emitted per second\n",
+ "\n",
+ "#Result\n",
+ "print \"The number of photons emitted per second are\",round(n/1e+30,2),\"*10**30\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The number of photons emitted per second are 17.15 *10**30\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.3, Page number 98"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "P=200; #power(W)\n",
+ "W=6123*10**-10; #wavelength(m)\n",
+ "c=3*10**8; #speed of light(m/s)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "\n",
+ "#Calculation\n",
+ "Op=0.5*P; #radiant output(J/s)\n",
+ "E=h*c/W; #energy content(J)\n",
+ "n=2/E; #number of quanta emitted per second\n",
+ "\n",
+ "#Result\n",
+ "print \"Number of quanta emitted per second is\",round(n/1e+18,2),\"*10**18\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Number of quanta emitted per second is 6.16 *10**18\n"
+ ]
+ }
+ ],
+ "prompt_number": 12
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.4, Page number 98"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "N=5*10**4; #no. of photons\n",
+ "W=3000*10**-10; #wavelength(m)\n",
+ "J=5*10**-3; #senstivity(A/W)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "c=3*10**8; #speed of light(m/s)\n",
+ "e=1.6*10**-19; #the charge on electron(C)\n",
+ "\n",
+ "#Calculation\n",
+ "E=h*c/W; #energy content of each photon(J)\n",
+ "TE=N*E; #total energy(J)\n",
+ "I=J*TE; #current produced(ampere)\n",
+ "n=I/e; #number of photo electrons ejected\n",
+ "\n",
+ "#Result\n",
+ "print \"number of photoelectrons emitted are\",int(n)\n",
+ "print \"answer given in the book varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "number of photoelectrons emitted are 1035\n",
+ "answer given in the book varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 16
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.5, Page number 99"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W=5*10**-7; #wavelength(m)\n",
+ "F=10**-5; #force(N)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "m=1.5*10**-3; #mass(kg)\n",
+ "c=3*10**8; #speed of light in (m/s)\n",
+ "S=0.1; #specific heat\n",
+ "\n",
+ "#Calculation\n",
+ "n=F*W/h; #number of photons\n",
+ "E=F*c/4200; #energy of each photon(kcal/s)\n",
+ "theta=E/(m*S); #rate of rise in temperature(C/s)\n",
+ "\n",
+ "#Result\n",
+ "print \"number of photons are\",round(n/1e+21,3),\"*10**21\"\n",
+ "print \"the rate of temperature rise is\",round(theta/1e+3,1),\"*10**3 C/s\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "number of photons are 7.547 *10**21\n",
+ "the rate of temperature rise is 4.8 *10**3 C/s\n"
+ ]
+ }
+ ],
+ "prompt_number": 24
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.6, Page number 99"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W=4500*10**-10; #wavelength(m)\n",
+ "V=150; #rated voltage(W)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "c=3*10**8; #speed of light(m/s)\n",
+ "\n",
+ "#Calculation\n",
+ "P=V*8/100; #lamp power emitted(W)\n",
+ "E=h*c/W; #energy carried by 1 photon(J) \n",
+ "n=P/E; #number of photons emitted per second\n",
+ "\n",
+ "#Result\n",
+ "print \"Number of photons emitted per second is\",round(n/1e+18,2),\"*10**18\"\n",
+ "print \"answer given in the book varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Number of photons emitted per second is 27.17 *10**18\n",
+ "answer given in the book varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 30
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.7, Page number 99"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "f=1*10**12; #frequency(Hz)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "\n",
+ "#Calculation\n",
+ "E=h*f; #energy per photon(J)\n",
+ "n=E/6.625; #number of photons\n",
+ "\n",
+ "#Result\n",
+ "print \"the number of photons required is\",n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "the number of photons required is 1e-22\n"
+ ]
+ }
+ ],
+ "prompt_number": 31
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.8, Page number 100"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W=5200*10**-10; #wavelength(m)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "m=9.12*10**-31; #mass of electron(kg)\n",
+ "\n",
+ "#Calculation\n",
+ "p=h/W; #momentum(kg-m/s)\n",
+ "v=p/m; #velocity(m/s)\n",
+ "\n",
+ "#Result\n",
+ "print \"velocity is\",round(v),\"m/s\"\n",
+ "print \"answer given in the book varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "velocity is 1397.0 m/s\n",
+ "answer given in the book varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 33
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.9, Page number 105"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "v=7*10**5; #maximum speed(m/sec)\n",
+ "f=8*10**14; #frequency(Hz)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "c=3*10**8; #speed of light(m/s)\n",
+ "m=9.12*10**-31; #mass of electron(kg)\n",
+ "\n",
+ "#Calulation\n",
+ "E=m*v*v/2; #energy(J)\n",
+ "fo=f-(E/h); #threshold frequency of the surface(Hz) \n",
+ "\n",
+ "#Result\n",
+ "print \"the threshold frequency is\",round(fo/1e+14,2),\"*10**14 Hz\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "the threshold frequency is 4.63 *10**14 Hz\n"
+ ]
+ }
+ ],
+ "prompt_number": 37
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.10, Page number 106"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "Wo=2300*10; #threshold wavelength(Angstrom)\n",
+ "W=1800*10; #incident light wavelength(Angstrom)\n",
+ "\n",
+ "#Calculation\n",
+ "w=124000/Wo; #maximum energy of photoelectrons emitted(eV)\n",
+ "E=124000*((1/W)-(1/Wo)); #work function for tungsten(eV)\n",
+ "\n",
+ "#Result\n",
+ "print \"maximum energy of photoelectrons emitted is\",round(w,1),\"eV\"\n",
+ "print \"work function for tungsten is\",round(E,1),\"eV\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "maximum energy of photoelectrons emitted is 5.4 eV\n",
+ "work function for tungsten is 1.5 eV\n"
+ ]
+ }
+ ],
+ "prompt_number": 39
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.11, Page number 106"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W=6000; #wavelegth(Angstrom)\n",
+ "v=4*10**5; #velocity(m/sec)\n",
+ "m=9.12*10**-31; #mass of electron(kg)\n",
+ "e=1.6*10**-19; #the charge on electron(C)\n",
+ "\n",
+ "#Calculation\n",
+ "KE=m*v**2/(2*e); #kinetic energy of photo electronns(eV)\n",
+ "WF=12400/W; #energy content of photon(eV)\n",
+ "Wo=12400/(WF-KE); #photo electric threshold wavelength(angstrom)\n",
+ "\n",
+ "#Result\n",
+ "print \"The Kinetic energy is\",KE,\"eV\"\n",
+ "print \"The threshold wavelength is\",int(Wo),\"Angstrom\"\n",
+ "print \"answer given in the book varies due to rounding off errors\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The Kinetic energy is 0.456 eV\n",
+ "The threshold wavelength is 7698 Angstrom\n",
+ "answer given in the book varies due to rounding off errors\n"
+ ]
+ }
+ ],
+ "prompt_number": 43
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.12, Page number 106"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "Wo=4.8; #work function(eV)\n",
+ "W=2220; #wavelength(angstrom)\n",
+ "\n",
+ "#Calculation\n",
+ "E=12400/W; #energy of light photon(eV)\n",
+ "Emax=E-Wo; #maximum kinetic energy(eV)\n",
+ "\n",
+ "#Result\n",
+ "print \"maximum kinetic energy is\",round(Emax,3),\"eV\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "maximum kinetic energy is 0.786 eV\n"
+ ]
+ }
+ ],
+ "prompt_number": 46
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.13, Page number 106"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W=4000*10**-10; #wavelength(m)\n",
+ "Vs=0.4; #retarding potential(eV)\n",
+ "h=6.625*10**-34; #Plank's constant\n",
+ "c=3*10**8; #speed of light(m/s)\n",
+ "e=1.6*10**-19; #the charge on electron(C)\n",
+ "\n",
+ "#Calculation\n",
+ "f=c/W; #frequency of light(Hz)\n",
+ "E=h*f/e; #photon energy(eV)\n",
+ "Wo=E-Vs; #work function(eV)\n",
+ "fo=Wo/h*e; #threshold frequency(Hz)\n",
+ "NE=(E-Wo)*e; #net energy(J)\n",
+ "\n",
+ "#Result\n",
+ "print \"The light frequency is\",f,\"Hz\"\n",
+ "print \"The photon energy is\",round(E,1),\"eV\"\n",
+ "print \"The work function is\",round(Wo,1),\"eV\"\n",
+ "print \"The threshold frequency is\",round(fo/1e+14,1),\"*10**14 Hz\"\n",
+ "print \"The net energy is\",NE,\"J\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The light frequency is 7.5e+14 Hz\n",
+ "The photon energy is 3.1 eV\n",
+ "The work function is 2.7 eV\n",
+ "The threshold frequency is 6.5 *10**14 Hz\n",
+ "The net energy is 6.4e-20 J\n"
+ ]
+ }
+ ],
+ "prompt_number": 51
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.14, Page number 107"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W1=3310*10**-10; #photon wavelength(m)\n",
+ "W2=5000*10**-10; #photon wavelength(m)\n",
+ "E1=3*10**-19; #electron energy(J)\n",
+ "E2=0.972*10**-19; #electron energy(J)\n",
+ "c=3*10**8; #speed of light in m/s\n",
+ "\n",
+ "#Calculation\n",
+ "h=(E1-E2)*(W1*W2)/(c*(W2-W1)); #planck's constant(Js)\n",
+ "Wo=c*h/E1; #threshold wavelength(m) \n",
+ "\n",
+ "#Result\n",
+ "print \"the plancks const is\",round(h/1e-34,2),\"*10**-34 Js\"\n",
+ "print \"The threshold wavelength is\",round(Wo*1e+10),\"*10**-10 m\"\n",
+ "print \"answer given in the book is wrong\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "the plancks const is 6.62 *10**-34 Js\n",
+ "The threshold wavelength is 6620.0 *10**-10 m\n",
+ "answer given in the book is wrong\n"
+ ]
+ }
+ ],
+ "prompt_number": 57
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.15, Page number 107"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W=6525; #wavelength(angstrom)\n",
+ "\n",
+ "#Calculation\n",
+ "Vo_a=12400*((1/4000)-(1/W)); #stopping potential(V)\n",
+ "Vo_b=12400*((1/2000)-(1/W)); #stopping potential(V)\n",
+ "Vo_c=12400*((1/2000)-(2/W)); #stopping potential(V)\n",
+ "\n",
+ "#Result\n",
+ "print \"Stopping potential is\",round(Vo_a,1),\"Volt\"\n",
+ "print \"Stopping potential is\",round(Vo_b,1),\"Volt\"\n",
+ "print \"Stopping potential is\",round(Vo_c,1),\"Volt\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Stopping potential is 1.2 Volt\n",
+ "Stopping potential is 4.3 Volt\n",
+ "Stopping potential is 2.4 Volt\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.16, Page number 107"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "Wo=5000; #wavelength(angstrom)\n",
+ "V=3.1; #stopping potential(V)\n",
+ "\n",
+ "#Calcultion\n",
+ "W=1/((V/12400)+(1/Wo)); #wavelength(angstrom)\n",
+ "\n",
+ "#Result\n",
+ "print \"The wavelength is\",int(W),\"Angstrom\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The wavelength is 2222 Angstrom\n"
+ ]
+ }
+ ],
+ "prompt_number": 5
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.17, Page number 108"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "W=2000; #wavelength(Angstrom)\n",
+ "Vs=4.2; #Work Function(eV)\n",
+ "e=1.6*10**-19; #the charge on electron(C)\n",
+ "\n",
+ "#Calculation\n",
+ "E=12400/W; #photon energy(eV)\n",
+ "Emax=(E-Vs)*e; #maximum kinetic energy(J)\n",
+ "Emin=0; #minimum kinetic energy\n",
+ "Vo=Emax/e; #stopping potential(V)\n",
+ "Wo=12400/Vs; #cut off wavelength(angstrom)\n",
+ "\n",
+ "#Result\n",
+ "print \"Kinetic Energy of fastest photoelectron is\",Emax,\"J\"\n",
+ "print \"Kinetic Energy of slowest moving electron is\",Emin,\"J\"\n",
+ "print \"Stopping potential is\",Vo,\"V\"\n",
+ "print \"The cutoff wavelength is\",round(Wo,1),\"Angstrom\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Kinetic Energy of fastest photoelectron is 3.2e-19 J\n",
+ "Kinetic Energy of slowest moving electron is 0 J\n",
+ "Stopping potential is 2.0 V\n",
+ "The cutoff wavelength is 2952.4 Angstrom\n"
+ ]
+ }
+ ],
+ "prompt_number": 8
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example number 5.18, Page number 108"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#import modules\n",
+ "import math\n",
+ "from __future__ import division\n",
+ "\n",
+ "#Variable declaration\n",
+ "Vs1=4.6; #Stopping Potential(V)\n",
+ "Vs2=12.9; #Stopping Potential(V)\n",
+ "f1=2*10**15; #frequency(Hz)\n",
+ "f2=4*10**15; #frequency(Hz)\n",
+ "e=1.6*10**-19; #the charge on electron(C)\n",
+ "\n",
+ "#Calculation\n",
+ "h=((Vs2-Vs1)*e)/(f2-f1); #planck's constant(Js)\n",
+ "\n",
+ "#Result\n",
+ "print \"The Planck's constant is\",h,\"Js\"\n",
+ "print \"answer given in the book is wrong\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "The Planck's constant is 6.64e-34 Js\n",
+ "answer given in the book is wrong\n"
+ ]
+ }
+ ],
+ "prompt_number": 10
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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