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+clc//
+//
+//
+
+//Variable declaration
+n1=1;n2=1;n3=1;
+h=6.62*10^-34; //planck's constant
+m=9.1*10^-31; //mass(kg)
+L=0.1*10^-9; //side(m)
+
+//Calculation
+E1=h^2*(n1^2+n2^2+n3^2)/(8*m*1.6*10^-19*L^2); //lowest energy of electron(eV)
+
+//Result
+printf("\n lowest energy of electron is %0.1f eV",E1)