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+//Example 19.3 // position of fermi level 
+clc;
+clear;
+//given data :
+Eo=.3;// initial position in eV
+T=300;//initially temperature in kelvin
+T1=330;// final temperature in kelvin
+E=Eo*T1/T;// (formula to calculate) final position in eV
+disp(E,"new position of fermi level in eV")