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diff --git a/Engineering_Physics/Chapter_4.ipynb b/Engineering_Physics/Chapter_4.ipynb new file mode 100644 index 00000000..02198aef --- /dev/null +++ b/Engineering_Physics/Chapter_4.ipynb @@ -0,0 +1,343 @@ +{ + "metadata": { + "name": "Chapter 4" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": "Quantum Physics" + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.1, Page number 133 " + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the change in wavelength\n\n#importing modules\nimport math\n\n#Variable declaration\nh=6.63*10**-34; #plancks constant in Js\nm0=9.1*10**-31; #mass of the electron in kg\nc=3*10**8; #velocity of light in m/s\nphi=135; #angle of scattering in degrees\nphi=phi*0.0174532925 #converting degrees to radians \n\n#Calculation\ndelta_lamda=(h*(1-math.cos(phi)))/(m0*c);\n\n#Result\nprint(\"change in wavelength in metres is\",delta_lamda);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('change in wavelength in metres is', 4.1458307496867315e-12)\n" + } + ], + "prompt_number": 6 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.2, Page number 134 " + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the compton shift, wavelength,energy and angle\n\n#importing modules\nimport math\n\n#Variable declaration\nh=6.63*10**-34; #plancks constant in Js\nm0=9.1*10**-31; #mass of the electron in kg\nc=3*10**8; #velocity of light in m/s\nlamda=2; #wavelength in angstrom\nlamdaA=lamda*10**-10; #converting lamda from Angstrom to m\nphi=90; #angle of scattering in degrees\nphi=phi*0.0174532925 #converting degrees to radians \n\n#Calculation\ndelta_lamda=(h*(1-math.cos(phi)))/(m0*c);\ndelta_lamda=delta_lamda*10**10; #converting delta_lamda from m to Angstrom\ndelta_lamda=math.ceil(delta_lamda*10**5)/10**5; #rounding off to 5 decimals\nlamda_dash=delta_lamda+lamda;\nlamdaA_dash=lamda_dash*10**-10; #converting lamda_dash from Angstrom to m\n#energy E=h*new-h*new_dash\nE=h*c*((1/lamdaA)-(1/lamdaA_dash));\nEeV=E/(1.602176565*10**-19); #converting J to eV\nEeV=math.ceil(EeV*10**3)/10**3; #rounding off to 3 decimals\nnew=c/lamda;\nnew_dash=c/lamda_dash;\ntheta=math.atan((h*new*math.sin(phi))/((h*new)-(h*new_dash*math.cos(phi))));\ntheta=theta*57.2957795; #converting radians to degrees\n\n#Result\nprint(\"change in compton shift in Angstrom is\",delta_lamda);\nprint(\"wavelength of scattered photons in Angstrom is\",lamda_dash);\nprint(\"energy of recoiling electron in J is\",E);\nprint(\"energy of recoiling electron in eV is\",EeV);\nprint(\"angle at which recoiling electron appears in degrees is\",int(theta));\n\n#answers given in the book are wrong", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('change in compton shift in Angstrom is', 0.02429)\n('wavelength of scattered photons in Angstrom is', 2.02429)\n('energy of recoiling electron in J is', 1.1933272900621974e-17)\n('energy of recoiling electron in eV is', 74.482)\n('angle at which recoiling electron appears in degrees is', 45)\n" + } + ], + "prompt_number": 10 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.3, Page number 135" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the compton shift, wavelength of the scattered photon\n\n#importing modules\nimport math\n\n#Variable declaration\nh=6.626*10**-34; #plancks constant in Js\nm0=9.1*10**-31; #mass of the electron in kg\nc=3*10**8; #velocity of light in m/s\nphi=60; #angle of scattering in degrees\nphi=phi*0.0174532925; #converting degrees to radians\nE=10**6; #energy of photon in eV\nE=E*1.6*10**-19; #converting eV into J\n\n#Calculation\ndelta_lamda=(h*(1-math.cos(phi)))/(m0*c);\ndelta_lamda=delta_lamda*10**10; #converting metre to angstrom\ndelta_lamda=math.ceil(delta_lamda*10**4)/10**4; #rounding off to 4 decimals\nlamda=(h*c)/E;\nlamdaA=lamda*10**10; #converting metre to angstrom\nlamda_dash=delta_lamda+lamdaA;\nlamda_dash=math.ceil(lamda_dash*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"compton shift in angstrom is\",delta_lamda);\nprint(\"energy of incident photon in m\",lamda);\nprint(\"wavelength of scattered photons in angstrom is\",lamda_dash);\n\n#answer for wavelength of scattered photon given in the book is wrong", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('compton shift in angstrom is', 0.0122)\n('energy of incident photon in m', 1.242375e-12)\n('wavelength of scattered photons in angstrom is', 0.025)\n" + } + ], + "prompt_number": 13 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.4, Page number 135" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the number of photons emitted\n\n#importing modules\nimport math\n\n#Variable declaration\nh=6.626*10**-34; #plancks constant in Js\nc=3*10**8; #velocity of light in m/s\nlamda=5893; #wavelength in angstrom\nP=60; #output power in Watt\n\n#Calculation\nlamda=lamda*10**-10; #wavelength in metre\nE=(h*c)/lamda;\nEeV=E/(1.602176565*10**-19); #converting J to eV\nEeV=math.ceil(EeV*10**4)/10**4; #rounding off to 4 decimals\nN=P/E;\n\n#Result\nprint(\"energy of photon in J is\",E);\nprint(\"energy of photon in eV is\",EeV);\nprint(\"number of photons emitted per se cond is\",N);\n\n#answer for energy in eV given in the book is wrong", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('energy of photon in J is', 3.373154590191753e-19)\n('energy of photon in eV is', 2.1054)\n('number of photons emitted per se cond is', 1.7787503773015396e+20)\n" + } + ], + "prompt_number": 15 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.5, Page number 136" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the momentum, energy and mass of a photon\n\n#importing modules\nimport math\n\n#Variable declaration\nh=6.626*10**-34; #plancks constant in Js\nc=3*10**8; #velocity of light in m/s\nlamda=10; #wavelength in angstrom\n\n#Calculation\nlamda=lamda*10**-10; #wavelength in metre\nE=(h*c)/lamda;\nEeV=E/(1.602176565*10**-19); #converting J to eV\nEeV=EeV*10**-3; #converting eV to keV\nEeV=math.ceil(EeV*10**3)/10**3; #rounding off to 3 decimals\nP=h/lamda;\nM=h/(lamda*c);\n\n#Result\nprint(\"energy of photon in J is\",E);\nprint(\"energy of photon in keV is\",EeV);\nprint(\"momentum in kg m/sec is\",P);\nprint(\"mass of photon in kg is\",M);\n\n#answer for energy of photon in keV given in the book is wrong by 1 decimal", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('energy of photon in J is', 1.9878e-16)\n('energy of photon in keV is', 1.241)\n('momentum in kg m/sec is', 6.626e-25)\n('mass of photon in kg is', 2.2086666666666664e-33)\n" + } + ], + "prompt_number": 18 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.6, Page number 136" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the wavelength\n\n#importing modules\nimport math\n\n#Variable declaration\nh=6.626*10**-34; #plancks constant in Js\nm=9.1*10**-31; #mass of the electron in kg\ne=1.602*10**-19;\nV=1.25; #potential difference in kV\n\n#Calculation\nV=V*10**3; #converting kV to V\nlamda=h/math.sqrt(2*m*e*V);\nlamda=lamda*10**10; #converting metre to angstrom\nlamda=math.ceil(lamda*10**4)/10**4; #rounding off to 4 decimals\n\n#Result\nprint(\"de Broglie wavelength in angstrom is\",lamda);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('de Broglie wavelength in angstrom is', 0.3471)\n" + } + ], + "prompt_number": 21 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.7, Page number 136" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the de Broglie wavelength\n\n#importing modules\nimport math\n\n#Variable declaration\nE=45; #energy of electron in eV\nE=E*1.6*10**-19; #energy in J\nh=6.626*10**-34; #plancks constant in Js\nm=9.1*10**-31; #mass of the electron in kg\n\n#Calculation\nlamda=h/math.sqrt(2*m*E);\nlamda=lamda*10**10; #converting metres to angstrom\nlamda=math.ceil(lamda*10**4)/10**4; #rounding off to 4 decimals\n\n#Result\nprint(\"de Broglie wavelength in angstrom is\",lamda);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('de Broglie wavelength in angstrom is', 1.8305)\n" + } + ], + "prompt_number": 24 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.8, Page number 137" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the de Broglie wavelength\n\n#importing modules\nimport math\n\n#Variable declaration\nv=10**7; #velocity of electron in m/sec\nh=6.626*10**-34; #plancks constant in Js\nm=9.1*10**-31; #mass of the electron in kg\n\n#Calculation\nlamda=h/(m*v);\nlamda=lamda*10**10; #converting metres to angstrom\nlamda=math.ceil(lamda*10**4)/10**4; #rounding off to 4 decimals\n\n#Result\nprint(\"de Broglie wavelength in angstrom is\",lamda);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('de Broglie wavelength in angstrom is', 0.7282)\n" + } + ], + "prompt_number": 25 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.9, Page number 137" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the de Broglie wavelength of alpha particle\n\n#importing modules\nimport math\n\n#Variable declaration\nV=1000; #potential difference in V\nh=6.626*10**-34; #plancks constant in Js\nm=1.67*10**-27; #mass of proton in kg\ne=1.6*10**-19; #charge of electron in J\n\n#Calculation\nlamda=h/math.sqrt(2*m*e*V);\n\n#Result\nprint(\"de Broglie wavelength of alpha particle in metre is\",lamda);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('de Broglie wavelength of alpha particle in metre is', 9.063964727801313e-13)\n" + } + ], + "prompt_number": 26 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.10, Page number 138" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the probability of finding the particle\n\n#importing modules\nimport math\n\n#Variable declaration\nL=25; #width of potential in armstrong\ndelta_x=0.05; #interval in armstrong\nn=1; #particle is in its least energy\nx=L/2; #particle is at the centre\npi=180; #angle in degrees\n\n#Calculation\npi=pi*0.0174532925; #angle in radians\nL=L*10**-10; #width in m\ndelta_x=delta_x*10**-10; #interval in m\n#probability P = integration of (A**2)*(math.sin(n*pi*x/L))**2*delta_x\n#but A=math.sqrt(2/L)\n#since the particle is in a small interval integration need not be applied\n#therefore P=2*(L**(-1))*(math.sin(n*pi*x/L))**2*delta_x\nP=2*(L**(-1))*((math.sin(n*pi*x/L))**2)*delta_x;\nP=math.ceil(P*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"probability of finding the particle is\",P);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('probability of finding the particle is', 0.004)\n" + } + ], + "prompt_number": 27 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.11, Page number 138" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the lowest energy of electron in eV\n\n#importing modules\nimport math\n\n#Variable declaration\nn=1;\nh=6.626*10**-34; #plancks constant in Js\nm=9.1*10**-31; #mass of the electron in kg\nL=1; #width of potential well in angstrom\n\n#Calculation\nL=L*10**-10; #converting angstrom into metre\nE=((n**2)*h**2)/(8*m*L**2);\nEeV=E/(1.6*10**-19); #converting J to eV\nEeV=math.ceil(EeV*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"lowest energy of electron in J is\",E);\nprint(\"lowest energy of electron in eV is\",EeV);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('lowest energy of electron in J is', 6.030752197802197e-18)\n('lowest energy of electron in eV is', 37.693)\n" + } + ], + "prompt_number": 28 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.12, Page number 139" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the lowest energy of the system\n\n#importing modules\nimport math\n\n#Variable declaration\nn=1;\nh=6.626*10**-34; #plancks constant in Js\nm=9.1*10**-31; #mass of the electron in kg\nL=1; #width of potential well in angstrom\n\n#Calculation\nL=L*10**-10; #converting angstrom into metre\nE=(2*(n**2)*h**2)/(8*m*L**2);\nE=E/(1.6*10**-19); #converting J to eV\nE=math.ceil(E*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"lowest energy of system in eV is\",E);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('lowest energy of system in eV is', 75.385)\n" + } + ], + "prompt_number": 29 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.13, Page number 139" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the lowest energy of the system and quantum numbers\n\n#importing modules\nimport math\n\n#Variable declaration\nh=6.626*10**-34; #plancks constant in Js\nm=9.1*10**-31; #mass of the electron in kg\nL=1; #width of potential well in angstrom\n\n#Calculation\nL=L*10**-10; #converting angstrom into metre\n#according to pauli's exclusion principle, 1st electron occupies n1=1 and second electron occupies n2=2\nn1=1;\nn2=2;\nE=((2*(n1**2)*h**2)/(8*m*L**2))+(((n2**2)*h**2)/(8*m*L**2));\nE=E/(1.6*10**-19); #converting J to eV\nE=math.ceil(E*10**3)/10**3; #rounding off to 3 decimals\n\n#Result\nprint(\"lowest energy of system in eV is\",E);\nprint(\"quantum numbers are\");\nprint(\"n=1,l=0,mL=0,mS=+1/2\");\nprint(\"n=1,l=0,mL=0,mS=-1/2\");\nprint(\"n=2,l=0,mL=0,mS=+1/2\");", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('lowest energy of system in eV is', 226.154)\nquantum numbers are\nn=1,l=0,mL=0,mS=+1/2\nn=1,l=0,mL=0,mS=-1/2\nn=2,l=0,mL=0,mS=+1/2\n" + } + ], + "prompt_number": 30 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.14, Page number 140" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the mass of the particle\n\n#Variable declaration\nn=1;\nh=6.626*10**-34; #plancks constant in Js\nL=100; #width of potential well in angstrom\n\n#Calculation\nL=L*10**-10; #converting angstrom into metre\nE=0.025; #lowest energy in eV\nE=E*(1.6*10**-19); #converting eV to J\nm=((n**2)*h**2)/(8*E*L**2);\n\n#Result\nprint(\"mass of the particle in kg is\",m);", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('mass of the particle in kg is', 1.3719961249999998e-31)\n" + } + ], + "prompt_number": 31 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": "Example number 4.15, Page number 141" + }, + { + "cell_type": "code", + "collapsed": false, + "input": "#To calculate the energy density\n\n#importing modules\nimport math\n\n#Variable declaration\nk=1.38*10**-23;\nT=6000; #temperature in K\nh=6.626*10**-34; #plancks constant in Js\nc=3*10**8; #velocity of light in m/s\nlamda1=450; #wavelength in nm\nlamda2=460; #wavelength in nm\n\n#Calculation\nlamda1=lamda1*10**-9; #converting nm to metre\nlamda2=lamda2*10**-9; #converting nm to metre\nnew1=c/lamda1;\nnew2=c/lamda2;\nnew=(new1+new2)/2;\nA=math.exp((h*new)/(k*T));\nrho_v=(8*math.pi*h*new**3)/(A*c**3);\n\n#Result\nprint(\"energy density of the black body in J/m^3 is\",rho_v);\n\n#answer given in the book is wrong", + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": "('energy density of the black body in J/m^3 is', 9.033622836188887e-16)\n" + } + ], + "prompt_number": 32 + }, + { + "cell_type": "code", + "collapsed": false, + "input": "", + "language": "python", + "metadata": {}, + "outputs": [] + } + ], + "metadata": {} + } + ] +}
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