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diff --git a/3020/CH11/EX11.1/ex11_1.sce b/3020/CH11/EX11.1/ex11_1.sce
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+clc;
+clear all;
+lambda = 5900e-10; // Wavelength of the sodium D line in meters
+c = 3e8;// Velocity of air
+h = 6.626e-34; // Plancks constant
+e = 1.602e-19; // Charge of an electron
+E = (h*c)/(lambda*e);
+disp('eV',E,'The energy of the first excited state is')