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Title: Ejs Open Source Double Slit Diffraction ModelPost by: lookang on October 15, 2011, 09:54:27 pm
Ejs Open Source Double Slit Diffraction Model by lookang based on the works of Fu-Kwun Hwang found here
reference: Ejs Open Source Single Slit Diffraction Model by Fu-Kwun Hwang remixed by lookang http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2314.0 Superposition of several waves http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2082.0 by Fu-Kwun Hwang other good applets JDK Double slit interference by Fu-Kwun Hwang http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=20.0 Title: Re: Ejs Open Source Double Slit Diffraction ModelPost by: lookang on October 16, 2011, 08:22:38 pm
changes made:
redesign the slits to be 2 instead of the older single slit made the 2 slits symmetric centered with moved by y slider add the 2 slits scalarField by introducing the idea of superposition from the top set of secondary sources Code: for(int i=0;i yctop=yitop+i*dy; // duplicate for top slit ycc[i] = yi+i*dy; // by lookang for drawing source ycctop[i] = yitop+i*dy; // by lookang for drawing source for(int j=0;j // } // else if (x>x1){ // x=x1+j*d; // r=x-x1; // r is distance from array point x to slit position x1 // x2=(x-xc)*(x-xc); // } for(int k=0;k if (x zsum[j][k]=Math.sin(kw*r-omega*t)*n; // need n to compensate for the magnitude } else if (x>=x1){ r=Math.sqrt((x-xc)*(x-xc)+(y-yc)*(y-yc)); rtop=Math.sqrt((x-xctop)*(x-xctop)+(y-yctop)*(y-yctop)); zsum[j][k]+=Math.sin(kw*r-omega*t)+Math.sin(kw*rtop-omega*t); } } } } add path difference tools to allow sense making that when path difference = integer of wavelength, correspond to constructive interference. and 1/2 of integer is destructive interference like in Ejs Open Source Ripple Tank Interference Model java applet http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2067.0 17 october 2011 add d separation = ycentre2*2 to align with teaching and learning this simulation is made possible by the open source codes shared by Fu-Kwun Hwang, the true master teacher! enjoy! |