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{
"metadata": {
"name": "",
"signature": "sha256:c0c85d5a39a8e445759e5cb8d2f67d6ba3787632cdef1705d098045c10def4f6"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 6 :\n",
"Photoelectric Effect"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.1 Page No : 191"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\n",
"import math \n",
"\n",
"# Variables\n",
"h = 6.62*10**-34; #Planck's constant(in m2*kg/s)\n",
"c = 3*10**8; #speed of light (in m/s)\n",
"e = 1.6*10**-19; #electron charge(in coulomb)\n",
"Wavelength_1 = 2300*10**-10;\n",
"Wavelength_2 = 1800*10**-10;\n",
"\n",
"# Calculation\n",
"W = h*c/Wavelength_1;\t\t\t#Work function\n",
"E_in = h*c/Wavelength_2;\n",
"E = E_in-W;\t\t\t#kinetic energy of the ejected electron(in Joules)\n",
"E_1 = E/e;\t\t\t#kinetic energy of the ejected electron(in eV)\n",
"\n",
"# Results\n",
"print 'kinetic energy of the ejected electron in = %.1f eV'%E_1\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"kinetic energy of the ejected electron in = 1.5 eV\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.2 Page No : 191"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\n",
"import math \n",
"\n",
"# Variables\n",
"h = 6.625*(10**(-34));\t#Planck's constant(in m2*kg/s)\n",
"c = 3*10**8;\t\t\t#speed of light (in m/s)\n",
"e = 1.602*10**-19;\t\t#electron charge(in coulomb)\n",
"W = 2.3;\t\t\t #work (in eV)\n",
"\n",
"# Calculation\n",
"W_1 = W*e;\t\t\t#work (in joules)\n",
"v_o = W_1/h;\t\t\t#threshold frequency(in Hz)\n",
"Wavelength = (h*c/W_1)/10**(-10);\t\t\t#Wavelength in Angstrom\n",
"\n",
"# Results\n",
"print 'threshold frequency(Hz) = %.2e'%v_o\n",
"print 'Wavelength in %.0f Angstrom'%(round(Wavelength,-1))\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"threshold frequency(Hz) = 5.56e+14\n",
"Wavelength in 5390 Angstrom\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.3 Page No : 192"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\n",
"\n",
"import math \n",
"\n",
"# Variables\n",
"h = 6.625*(10**(-34));\t\t\t#Planck's constant(in m2*kg/s)\n",
"c = 3*10**8;\t\t\t#speed of light (in m/s)\n",
"e = 1.602*10**-19;\t\t\t#electron charge(in coulomb)\n",
"\n",
"# Calculation\n",
"wavelength = 6800*10**-10;\t\t\t#wavelength of radiation\n",
"v_o = c/wavelength;\t\t\t#frequency\n",
"W = h*v_o;\t\t\t#Work function\n",
"\n",
"# Results\n",
"print 'threshold frequency in = %.2e Hz'%v_o\n",
"print 'work function of metal in = %.2e joule'%W\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"threshold frequency in = 4.41e+14 Hz\n",
"work function of metal in = 2.92e-19 joule\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.4 Page No : 192"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\n",
"import math \n",
"\n",
"# Variables\n",
"h = 6.625*(10**(-34));\t\t\t#Planck's constant(in m2*kg/s)\n",
"c = 3.*10**8;\t\t\t#speed of light (in m/s)\n",
"\n",
"# Calculation\n",
"L_r = 150*8./100;\t\t\t#Lamp rating(in joule)\n",
"wavelength = 4500.*10**-10;\t\t\t#in meter\n",
"W = h*c/wavelength;\t\t\t#work function\n",
"N = L_r/W;\t\t\t#number of photons emitted by lamp per second\n",
"\n",
"# Results\n",
"print 'number of photons emitted by lamp per second = %.1e'%N\n",
"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"number of photons emitted by lamp per second = 2.7e+19\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.5 Page No : 193"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\n",
"import math \n",
"\n",
"# Variables\n",
"h = 6.6*(10**(-34));\t\t\t#Planck's constant(in m2*kg/s)\n",
"c = 3*10**8;\t\t\t#speed of light (in m/s)\n",
"e = 1.6*10**-19;\t\t\t#electron charge(in coulomb)\n",
"W = 2.24;\t\t\t#work function(in eV)\n",
"\n",
"# Calculation\n",
"W_1 = W*e;\t\t\t#work function(in joule)\n",
"v = (W_1/h)*10**-10;\t\t\t#frequency\n",
"wavelength = c/v;\t\t\t#region of electrons spectrum is less than(in angstrom)\n",
"\n",
"# Results\n",
"print 'region of electrons spectrum is less than %d angstrom'%round(wavelength,-1)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"region of electrons spectrum is less than 5520 angstrom\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.6 Page No : 193"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\n",
"import math \n",
"\n",
"# Variables\n",
"h = 6.625*(10**(-34));\t\t\t#Planck's constant(in m2*kg/s)\n",
"c = 3*10**8;\t\t\t#speed of light (in m/s)\n",
"P_o = 10*10**3;\t\t\t#Power of radio receiver (in Watt)\n",
"\n",
"# Calculation\n",
"v = 440*10**3;\t\t\t#Operating frequency\n",
"E = h*v;\t\t\t#Energy of each electron\n",
"N = P_o/E;\t\t\t#Number of photons emitted/sec\n",
"\n",
"# Results\n",
"print 'Number of photons emitted/sec by radio receiver = %.1e'%N\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Number of photons emitted/sec by radio receiver = 3.4e+31\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6.7 Page No : 193"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\t\t\t\n",
"\n",
"import math \n",
"\n",
"# Variables\n",
"W_t = 4.52;\t\t\t#Work function for tungesten(in eV)\n",
"W_b = 2.5;\t\t\t#Work function for barrium(in eV)\n",
"h = 6.62*(10**(-34));\t\t\t#Planck's constant(in m2*kg/s)\n",
"c = 3*10**8;\t\t\t#speed of light (in m/s)\n",
"\n",
"# Calculation\n",
"e = 1.6*10**-19;\t\t\t#electron charge(in coulomb)\n",
"W_T = W_t*e;\t\t\t#Work function for tungesten(in Joule)\n",
"W_B = W_b*e;\t\t\t#Work function for barrium(in Joule)\n",
"Wavelength_T = (h*c/W_T)*10**10;\t\t\t#wavelength of light which can just eject electron from tungsten\n",
"Wavelength_B = (h*c/W_B)*10**10;\t\t\t#wavelength of light which can just eject electron from barrium\n",
"\n",
"# Results\n",
"print 'wavelength of light which can just eject electron from tungsten in = %.0f Angstrom'%Wavelength_T\n",
"print 'wavelength of light which can just eject electron from barrium in = %.0f Angstrom'%Wavelength_B\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"wavelength of light which can just eject electron from tungsten in = 2746 Angstrom\n",
"wavelength of light which can just eject electron from barrium in = 4965 Angstrom\n"
]
}
],
"prompt_number": 12
}
],
"metadata": {}
}
]
}
|
