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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 17: Chemistry in the atmosphere"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.1: computation_of_wavelength_of_a_photon_from_energy.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//computation of wavelength of a photon from energy\n",
+"\n",
+"clear;\n",
+"clc;\n",
+"\n",
+"printf('\t Example 17.1\n');\n",
+"\n",
+"E=498.7*10^3/(6.022*10^23);//energy in J/molecule\n",
+"h=6.63*10^-34;//plancks constant, J s\n",
+"v=E/h;//frequency of the photon, s^-1\n",
+"lambda=3*10^8/v;//wavelength in m, since v*lambda=speed of light in vacuum\n",
+"\n",
+"printf('\t the maximum wavelength of the photon which can dissociate an O2 molecule is : %4.0f nm\n',lambda*10^9);\n",
+"\n",
+"//End"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 17.3: Radioactive_decay_and_half_life.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"//Radioactive decay and half life\n",
+"\n",
+"clear;\n",
+"clc;\n",
+"\n",
+"printf('\t Example 17.3\n');\n",
+"\n",
+"Rninitial=1;//initial mass of Rn, g\n",
+"\n",
+"Rnfinal=Rninitial*0.5^10;//final mass of Rn, g\n",
+"\n",
+"printf('\t the amount of Rn left after 10 half lives is : %4.1f *10^-4 g\n',Rnfinal*10^4);\n",
+"\n",
+"//End"
+   ]
+   }
+],
+"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
+}