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//Variable declaration
h=6.63*10**-34; //planck's constant
c=3*10**8; //velocity of light(m/s)
lamda=1.55*10**-6; //wavelength(m)
e=1.6*10**-19;
//Calculation
Eg=h*c/(lamda*e); //energy gap(eV)
//Result
printf('energy gap is %0.3f eV \n',(Eg))
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