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{
"metadata": {
"name": "",
"signature": "sha256:766f8db46f5669c6f5759d5eab7e64f8d7d90b920fc4c9477c5cb4c2747c652e"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"5: Wave and Quantum Mechanics and X-rays"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 5.1, Page number 145"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"h = 6.63*10**-34; #planck's constant(J)\n",
"c = 3*10**8; #velocity of light(m/s)\n",
"lamda = 6328; #wavelength of laser(angstrom)\n",
"ev = 6.24*10**18; #conversion factor from J to eV\n",
"\n",
"#Calculation\n",
"lamda = lamda*10**-10; #wavelength of laser(m)\n",
"E = h*c/lamda; #energy of photon(J)\n",
"Eev = E*ev; #energy of photon(eV)\n",
"Eev = math.ceil(Eev*10**3)/10**3; #rounding off to 3 decimals\n",
"\n",
"#Result\n",
"print \"energy of photon is\",round(E/1e-19,2),\"*10**-19 J or\",Eev,\"eV\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"energy of photon is 3.14 *10**-19 J or 1.962 eV\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 5.2, Page number 145"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"lamda = 6730; #wavelength of laser(angstrom)\n",
"p = 1; #output power(mW)\n",
"h = 6.63*10**-34; #planck's constant(J)\n",
"c = 3*10**8; #velocity of light(m/s)\n",
"\n",
"#Calculation\n",
"p = p*10**-3; #output power(W)\n",
"lamda = lamda*10**-10; #wavelength of laser(m)\n",
"n = p*lamda/(h*c); #number of photons(per sec)\n",
"\n",
"#Result\n",
"print \"number of photons emitted is\",round(n/1e+15,2),\"*10**15 per sec\"\n",
"print \"answer given in the book is wrong\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"number of photons emitted is 3.38 *10**15 per sec\n",
"answer given in the book is wrong\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 5.3, Page number 146"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"l = 3*10**-2; #coherence length for sodium light(m)\n",
"lamda = 5893; #wavelength(angstrom)\n",
"c = 3*10**8; #velocity of light(m/s)\n",
"\n",
"#Calculation\n",
"lamda = lamda*10**-10; #wavelength(m)\n",
"n = l/lamda; #number of oscillations\n",
"tc = l/c; #coherence time(s)\n",
"\n",
"#Result\n",
"print \"number of oscillations is\",round(n)\n",
"print \"the coherence time is\",tc,\"s\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"number of oscillations is 50908.0\n",
"the coherence time is 1e-10 s\n"
]
}
],
"prompt_number": 14
}
],
"metadata": {}
}
]
}
|
