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"cells": [
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"cell_type": "heading",
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"metadata": {},
"source": "Chapter 5 : Phonons and Lattice Vibrations\n"
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": "Example 1: Generation of phonons, Page 137"
},
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"input": "# importing modules\nfrom __future__ import division\nimport math\n\n# Variable declaration\n\nl = 4 * 10**(-5); # the wavelength in cm for visible light -4000 Angstrom\nVs = 5 * 10**(5); # velocity of sound in cm/sec\nn = 1.5 ; # refractive index of the crystal\n\nNu = (2*Vs*2*3.14*n)/(l); # Nu = [2Vs(2*3.14)*n/l]*sin(psi/2) and here sin(psi/2)=1\n\n#Result\n\nprint \" The maximum phonon frequency is \", Nu , \" per sec\"\n\n",
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": " The maximum phonon frequency is 2.355e+11 per sec\n"
}
],
"prompt_number": 1
},
{
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"input": "",
"language": "python",
"metadata": {},
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]
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