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diff --git a/1427/CH19/EX19.9/19_9.sce b/1427/CH19/EX19.9/19_9.sce
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+++ b/1427/CH19/EX19.9/19_9.sce
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+//ques-19.9
+//Calculating kinetic energy of a moving electron
+clc
+w=4.8;//wavelength (in pm)
+m=9.11*10^-31;//mass of electron (in kg)
+h=6.63*10^-34;//(in Js)
+v=h/(m*w*10^-12);//velocity of electron (in m/s)
+KE=(1/2)*m*v^2;
+printf("The kinetic energy of the electron is %.3f*10^-14 J.",KE*10^14);