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+clc;
+clear all; 
+m = 9.1e-31; // Mass of an electron in Kg
+e = 1.6e-19; // Charge of an electron in Columbs
+h = 6.626e-34; // Planck's Constant
+V1 = 150; // Potential difference in Volts (case1)
+lambda1 = h/(sqrt(2*m*e*V1));
+disp('m',lambda1,'The de-broglie wavelength when V=150 volts is ') 
+V2 = 5000; // Potential difference in Volts (case2)
+lambda2 = h/(sqrt(2*m*e*V2));
+disp('m',lambda2,'The de-broglie wavelength when V=5000 volts is ')
+V3 = 400; // Potential difference in Volts (case3)
+lambda3 = h/(sqrt(2*m*e*V3));
+disp('m',lambda3,'The de-broglie wavelength when V=400 volts is ')
+//slight variation in answer than in textbook