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+clc();
+clear;
+// To calculate the energies of electron
+n2=2; //second quantum state
+n4=4; //fourth quantum state
+h=6.626*10^-34;
+m=9.1*10^-31; //mass in kg
+a=2; //potential box length in armstrong
+a=a*10^-10; //length in m
+A=n2^2*h^2;
+B=8*m*a^2;
+E2=A/B; //energy in j
+E2eV=E2/(1.6*10^-19); //energy in eV
+C=n4^2*h^2;
+E4=C/B; //energy in j
+E4eV=E4/(1.6*10^-19); //energy in eV
+printf("energy corresponding to second quantum state in Joule is");
+disp(E2);
+printf("energy corresponding to second quantum state in eV is");
+disp(E2eV);
+printf("energy corresponding to fourth quantum state in Joule is");
+disp(E4);
+printf("energy corresponding to fourth quantum state in eV is");
+disp(E4eV);
+
+//answers given in the book are wrong