disp("∆Ed = 13.64*(me/mo)*(1/(Єr^2))");
disp("me = 0.43m0");
d=11.7;  //say d=Єr
a=((d)^2);
c=(0.43);   //since me* = 0.43m0 and assumed (me*/m0)=c;
b=(13.64)*((c)/(a));  //say (∆Ed)=b
printf('\n∆Ed value is %f eV',b);