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{
"metadata": {
"name": "",
"signature": "sha256:57d22a7adb4054841cc52259e77089014f3c25ca9c50bc1dab4a74d78f09ccf3"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 17 Quantum theory"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.1 Page no 284"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"w=4000.0 #Wavelength of the light in Angstrom units\n",
"wf=2.25 #Work function of potassium in eV\n",
"m=(9.1*10**-31) #Mass of the electron in kg\n",
"v=(3*10**8) #Velocity of light in m/s\n",
"c=(1.6*10**-19) #Charge of the electron in coloumbs\n",
"h=6.626*10**-34 #Plancks constant in Js\n",
"\n",
"#Calculations\n",
"E=(h*v)/(w*10**-10*c)\n",
"KE=(E-wf)\n",
"\n",
"#Output\n",
"print\"Maximum kinetic energy of photoelectron is \",round(KE,3),\"eV\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Maximum kinetic energy of photoelectron is 0.856 eV\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.2 Page no 284"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"wf=1.9 #Workfunction of the material in eV\n",
"w=3000 #Wavelength of the light in Angstrom units\n",
"v=(3*10**8) #Velocity of light in m/s\n",
"c=(1.6*10**-19) #Charge of the electron in coloumbs\n",
"h=6.626*10**-34 #Plancks constant in Js\n",
"\n",
"#Calculations\n",
"V=(1/c)*(((h*v)/(w*10**-10))-(wf*c))\n",
"\n",
"#Output\n",
"print\"Stopping potential is \",round(V,2),\"V\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Stopping potential is 2.24 V\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.3 Page no 284"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"V=(70*10**3) #Accelerating potential in V\n",
"v=(3*10**8) #Velocity of light in m/s\n",
"c=(1.6*10**-19) #Charge of the electron in coloumbs\n",
"h=6.626*10**-34 #Plancks constant in Js\n",
"\n",
"#Calculations\n",
"lmin=((h*v)/(c*V))/10**-9\n",
"\n",
"#Output\n",
"print\"Shortest wavelength of X-rays produced is \",round(lmin,4),\"mm\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Shortest wavelength of X-rays produced is 0.0177 mm\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.4 Page no 284"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"w1=2 #Wavelength in Angstrom \n",
"Z1=24 #Target one\n",
"Z2=42.0 #Target two\n",
"a=1 #Constant value\n",
"\n",
"#Calculations\n",
"w2=w1*(Z1-a)**2/(Z2-a)**2\n",
"\n",
"#Output\n",
"print\"Wavelength is \",round(w2,2),\"Angstrom\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Wavelength is 0.63 Angstrom\n"
]
}
],
"prompt_number": 11
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 17.5 Page no 284"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#given\n",
"w=3 #Wavelength of the light in Angstrom\n",
"v=(3*10**8) #Velocity of light in m/s\n",
"h=6.626*10**-34 #Plancks constant in Js\n",
"q=40 #Scattering angle in degrees\n",
"m=(9.11*10**-31) #Mass of electron in kg\n",
"c=(1.6*10**-19) #Charge of the electron in coloumbs\n",
"\n",
"#Calculations\n",
"import math\n",
"dl=(h/(m*v))*(1-math.cos(q*3.14/180.0))/10.0**-10\n",
"l=(w+dl)\n",
"\n",
"#Output\n",
"print\"Wavelength of scattered X-rays is \",round(l,4),\"Angstrom\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Wavelength of scattered X-rays is 3.0057 Angstrom\n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}
|
