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+clc;clear;
+//Example 5.1
+
+//given values
+W1=4;//wavelength in Angstrom
+W2=1;//wavelength in Angstrom
+e=1.6*10^-19;//the charge on electron in C
+m=9.12*10^-31;//mass of electron in kg
+
+//calculation
+disp("Part (i)");
+E=12400/W1;
+disp(E,'The energy in eV is');
+v=sqrt(E*e*2/m);
+disp(v,'The velocity in m/s is');
+disp("Part (ii)");
+E=12400/W2;
+disp(E,'The energy in eV is');
+v=sqrt(E*e*2/m);
+disp(v,'The velocity in m/s is')
+\ No newline at end of file