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//Variable declaration
Kb=1.38*10**-23; //boltzmann constant
T1=300; //temperature(K)
T2=320; //temperature(K)
rho1=5; //resistivity(ohm m)
rho2=2.5; //resistivity(ohm m)
e=1.6*10**-19;
//Calculation
Eg=2*Kb*log(rho1/rho2)/((1/T1)-(1/T2)); //energy gap(J)
//Result
printf('energy gap is %0.3f eV \n',(Eg/e))
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