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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 4: Ultrasonic"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 4.1: find_distance_between_two_ships.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//chapter4,Example4_1,pg 84\n",
+"\n",
+"V1=343\n",
+"\n",
+"//S=V1*t1\n",
+"\n",
+"V2=1372\n",
+"\n",
+"//S=V2*t2\n",
+"\n",
+"dt=3//time difference\n",
+"\n",
+"S=((V1*V2)*(dt))/(V2-V1)\n",
+"\n",
+"printf('distance between two ships\n')\n",
+"\n",
+"printf('S=%.f m',S)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 4.2: calculate_depth_of_sea.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//chapter4,Example4_2,pg 84\n",
+"\n",
+"V=1700\n",
+"\n",
+"t=0.65\n",
+"\n",
+"d=(V*t)/2\n",
+"\n",
+"n=0.07*10^6\n",
+"\n",
+"lam=V/n\n",
+"\n",
+"printf('depth of sea\n')\n",
+"\n",
+"printf('d=%.1f m',d)\n",
+"\n",
+"printf('\nwavelength of pulse\n')\n",
+"\n",
+"printf('lam=%.4f m',lam)"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 4.3: calculate_natural_frequency.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//chapter4,Example4_3,pg 84\n",
+"\n",
+"P=1\n",
+"\n",
+"l=40*10^-3\n",
+"\n",
+"E=115*10^9\n",
+"\n",
+"D=7.25*10^3\n",
+"\n",
+"n=(P/(2*l))*sqrt(E/D)\n",
+"\n",
+"printf('natural frequency\n')\n",
+"\n",
+"printf('n=%.2f Hz',n)\n",
+"\n",
+"printf('\nfrequency of rod is more than audible range, rod cannot be used in magnetostriction oscillator\n')"
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}