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{
"metadata": {
"name": "",
"signature": "sha256:e2b842be083bc61cf1d1d9ada89de2502dedfb3d340e5f3b6d0b51d6c790688a"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"4: Ultrasonic"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 4.1, Page number 84"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"V1=343; #velocity of air(m/s)\n",
"V2=1372; #velocity f water(m/s)\n",
"dt=3; #time difference(s)\n",
"\n",
"\n",
"#Calculation\n",
"S=((V1*V2)*(dt))/(V2-V1); #distance between two ships(m)\n",
"\n",
"#Result\n",
"print \"distance between two ships is\",S,\"m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"distance between two ships is 1372.0 m\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 4.2, Page number 84"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"V=1700; #velocity of sound(m/s)\n",
"t=0.65; #time(s)\n",
"n=0.07*10**6; #frequency of source(Hz)\n",
"\n",
"\n",
"#Calculation\n",
"d=(V*t)/2; #depth of sea(m)\n",
"lamda=V/n; #wavelength of pulse(m)\n",
"\n",
"#Result\n",
"print \"depth of sea is\",d,\"m\"\n",
"print \"wavelength of pulse is\",round(lamda,4),\"m\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"depth of sea is 552.5 m\n",
"wavelength of pulse is 0.0243 m\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example number 4.3, Page number 84"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#importing modules\n",
"import math\n",
"from __future__ import division\n",
"\n",
"#Variable declaration\n",
"P=1; \n",
"l=40*10**-3; #length of pure rod(m)\n",
"E=115*10**9; #Young's modulus(N/m**2)\n",
"D=7.25*10**3; #density of pure iron(kg/m**3)\n",
"\n",
"#Calculation\n",
"n=(P/(2*l))*math.sqrt(E/D); #natural frequency of pure rod(Hz) \n",
"\n",
"#Result\n",
"print \"natural frequency of pure rod is\",round(n/10**3,1),\"kHz\"\n",
"print \"answer given in the book is wrong\"\n",
"print \"frequency of rod is more than audible range, rod can be used in magnetostriction oscillator\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"natural frequency of pure rod is 49.8 kHz\n",
"answer given in the book is wrong\n",
"frequency of rod is more than audible range, rod can be used in magnetostriction oscillator\n"
]
}
],
"prompt_number": 8
}
],
"metadata": {}
}
]
}
|
